Not only could you go into any platform, you could MAKE your platform, you could make new modes of entertainment, info, news and have a good, ol' jolly time doing so. That's how YouTube, Twitter, etc. started. And before even that, that's how Cinemassacre with AVGN started, and the comedy in the AVGN character and show was revolutionary and highly influential.
It was a new frontier, a wild west. Now it's been fully coopted, and only flickers of imagination and creativity in services and entertainment remain, like vtubers springing up around 2017. Now you're actively disincentivised from trying to compete with the giants, and if you try to without the right backing what awaits you is Parler's fate.
And it'll likely get worse before it'll get better. Remember SOPA/PIPA's copyright bullshit? I can see that making a hard comeback, given how much damage troons and jannies have done to the internet's ability to organise. As long as you give people like Lucas money, he'll say that retarded copyright laws are saving him from trolling or whatever the fuck.