You’re conflating free speech of individuals, with engagement driven black box recommendation algorithms of corporations.
It’s a common mistake. I think most people make it.

A company can allow people to post things, and for people to see them if they like, without algorithmically pushing it in endless scrolling interfaces.

For example Lemmy and Mastodon. You only see what you choose to subscribe to. The sites don’t chose to push any content into your feed because an algorithm thinks you’ll like it.

There is a big difference between the two and the later isn’t a hindrance to free speech.