Who's forcing what? They are just inspired by it, at least that's what the comment you are replying to is saying. If a private corporation wants to support or enable free speech, they are allowed to, just like you said. This is literally from Facebook itself so I'm not sure who is compelling who.

Nobody is forcing anyone to do anything.

Meta, as a large and powerful entity with the ability to censor as much or more than many governments, is opting to allow free speech on its platforms. So is X. That spirit is inspired by the Bill of Rights, not Elon Musk.

If you’re going to attempt to be pedantic, can you at least work on basic reading comprehension?

The concept of a large and powerful entity allowing free speech is in the spirit of the Bill of Rights, whether the large and powerful entity is government or not.

The parent poster was taking the position that allowing speech is somehow a Musk-derived idea, which is absurd.