The UK Supreme Court decision blocking Oatly from using the word ‘milk’ is being framed as a legal ruling. But for brands and retailers, this isn’t really about the courts. It exposes a live category problem.
This is a language story, and language is power. The dairy industry understands that whoever controls the words controls the category. ‘Milk’ isn’t just a descriptor, it’s a cultural shorthand for nourishment, naturalness and trust. Oatly built a brand identity around challenging that shorthand.
As a positive, the ruling signals that the category has grown up enough to be worth fighting over. You don’t take something to the Supreme Court unless the stakes are real. In a strange way, Dairy UK’s aggression confirms plant-based has moved from niche novelty to genuine competitive threat.
Plant-based competition
The challenge now is that although plant-based is no longer bought purely as a dairy substitute, much of the category is still marketed through dairy language and cues.
Early adopters were ideologically motivated by veganism, animal welfare or environmental conviction. Today’s mainstream buyer is far more pragmatic and fluid. They are not converting, they are navigating. Oat milk in a coffee shop, cows milk at home, with no particular guilt either way.
Motivation has shifted from belief to preference: taste, habit and lifestyle fit. That creates a bigger and more durable market, but it demands a different kind of brand. Brands are no longer recruiting a cause, they are competing on taste, price and practicality.
Despite this shift, dairy language continues to do heavy lifting at the point of purchase. ‘Milk’ communicates format, use case, taste and texture in a single word. When shoppers encounter something unfamiliar, borrowing that scaffolding dramatically reduces perceived risk. It is a shortcut, and shortcuts work.
Oatly used this successfully through its ‘Post Milk Generation’ positioning. The offering is instantly understood and requires little explanation. The problem is that shortcuts are rented, not owned. Brands are building on someone else’s foundations.
Borrowed language creates shelf risk
From a retail perspective, continued reliance on dairy language creates immediate risk. If terms like ‘oat milk’ disappear from labelling, shoppers who have never questioned what they are buying suddenly need to decode something new during a three-second shelf scan. That friction can quickly translate into lost sales.
More fundamentally, it exposes how little distinctive brand architecture many plant-based products have built. Strip away ‘milk’, ‘cheese’ or ‘butter’ and the question becomes clear: what is left?
If the category continues defining itself by comparison, differentiation becomes harder and risks commodification. Shelf sameness follows.
This ruling forces a practical rethink of how plant-based is presented in store. Retailers have largely positioned alternatives beside the dairy equivalents, defined by proximity and comparison. That approach made sense when the proposition was “like milk, but”. It makes less sense when brands are trying to establish plant-based products on their own terms.
Brands need to invest in visual and verbal systems that perform the navigation work that inherited dairy language once handled. Clearer occasion cues, stronger format signals and more confident communication around texture, taste and use case will become increasingly important in helping shoppers make quick decisions.
There is also a wider marketing lesson. Borrowed category language is a viable growth hack because it lowers the barrier to trial. Consumers understand what milk is, so they are willing to try oat milk. But borrowed language can also cap long-term growth.
The brands that succeed use inherited terminology as a bridge rather than a destination. The goal is to make shoppers comfortable enough to eventually meet the brand on its own terms. The ruling gives Oatly, and the wider category, an opportunity to redefine what plant-based stands for independently rather than through comparison.
Building plant-based on its own terms
What replaces inherited language is greater specificity and ownership of moments of consumption. Craft beer offers a useful parallel. It stopped positioning itself as “lager, but artisan” and instead developed an entirely new vocabulary built around flavour profiles, provenance and ritual.
Plant-based now faces a similar challenge: not what it replaces, but what it uniquely offers. What does oat bring to a flat white that nothing else does? That is where brand equity sits.
The lesson extends beyond plant-based. Any category that has grown in the shadow of an established one faces the same tension, from alcohol-free drinks to meat alternatives and functional beverages. Borrowing language helps brands enter a market, but long-term success depends on building a positive identity of their own.
Liquid Death provides a clear example. Bottled water has traditionally relied on the same cues of purity, nature and source. Rather than compete within that framework, the brand abandoned category conventions entirely, building a cultural identity that attracted consumers who would never have considered themselves bottled water buyers.
The uncomfortable implication for plant-based is clear. The brands that define the next phase of growth will not be those still fighting over the word ‘milk’, but those that no longer need it.
Steve Wildish is founder of Wildish & Co
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