First off english, having borrowed from several languages, has strange meat words.

In most other languages meat (animal) and meat (cut up animal) are the same word.

In english we have

• cow & beef
• pig & pork
• chicken & chicken (... hey wait a minute)

So, the alternative producers want to label their products with the terms of what they are an alternate to. Competing head on, or on the same shelf.
And the "real" commodity producers do not want that kind of competition and word dilution.

I know that Vegans are very confrontational and want to take over and destroy those filthy meat eaters. And so, they want to compete head to head, and destroy the words of meaning.

However, Vegans could make up all new words and basically own them. Be in in-group lingo. This would be very good for Vegans... except for their hatred of meat eaters.