>they should when they become a mega-corp

"mega-corp" is a term from dystopian cyberpunk fiction people just started applying to real life. "mega-corps" aren't a real thing (at least not until they become semi-autonomous states with their own currencies and private armies,) nor is "mega-corp" well enough defined that one can use it as a means to remove free speech and association rights. If those rights even worked that way, which they don't. Nor should they.

You may as well just say "any company I don't like," it means practically the same thing.