You have a right to publish your own materials. You do not have a right to make a newspaper publish a classified that is against its policies. Similarly, you can put whatever you want on your website. You cannot force another website carry your content simply because that website has achieved some level of distribution.

>I would argue that at that point they should be considered a governmental entity for laws around freedom of speech.

That's then infringing on their freedom of speech (or lack of). It's an interesting opinion but as it's so far away from any other I've read can you explain it more?

I'm thinking 'telephone network' rather than 'newspaper'. Phone companies were built as monopolies and faced strict regulation. Imagine your phone only working for company approved topics :)

Speech was worthy of protection under the universal declaration of human rights, and these platforms are becoming so fundamental to communication that they should be given the same consideration.

These platforms have become so centralized, powerful, and ubiquitous that censorship on a platform has a greater impact than preventing a person from speaking. That kind of power should never be wielded unchecked by a private entity.