In Germany, most vegan products have a "Vegan", "Veganer" or similar prefix/suffix. Brands that don't really care about vegans but really just want the money then bring out "plant-based" products, because there are no rules around that adjective.

On Plant-Based burgers you could still have mayonnaise with eggs in it. Or sauces that aren't vegan.

Also, they try to go for people that are really against "vegan" food because "plant-based" sounds less aggressive. In my opinion (am vegan), it's bs.