Could you point me to a comment where anyone said regulation should only apply to their competition? Any talk has been for the entire AI industry.
If you claim regulation favors the incumbents, well take it up with parent commenter whose comment seems to imply that regulation is needed!
Incumbents love regulation, because they are much better positioned to comply with it than any upstarts or new challengers. So, when a company like Anthropic gets a decent marketshare, their priority shifts to lobbying for regulation to limit competition.
It is a form of regulatory capture.