That is a really bad analogy. AFAICT the vast majority people saying "private platforms can do whatever" are specifically rejecting a first amendment argument,

That is a really bad analogy. AFAICT the vast majority people saying "private platforms can do whatever" are specifically rejecting a first amendment argument, and they're correct. FDA, EPA, etc. have nothing at all to do with that. Even if you broaden it to free speech in general, that's still true. They only become relevant when you're talking about all forms of regulation, but by then you're way beyond what anyone meant to address. With that "are you against" you're just constructing a massive strawman. Don't.