The 1st Amendment is only an acknowledgment that the government can't infringe on a natural right that pre-existed. If a company wants to proclaim an open platform but selectively enforce speech restrictions, then in a sense it is diminishing natural rights.
If it's an online platform dedicated to bake sales, then it's fine to limit it to that. But things like Youtube aren't -- they are a dominant platform and it's at least immoral or an affront to Enlightenment ideals to selectively limit from speech they disagree with based on political views.
thats the nature of the free market - if you don't like patreon, start your own more nazi-friendly site and see how it goes (hint: poorly). the state is unique in that it has a monopoly on regulating speech - a state should have very very little power in regulating what can be said, because you can't avoid the state. you can always find an internet community that will allow you to say something truly vile.
If it's an online platform dedicated to bake sales, then it's fine to limit it to that. But things like Youtube aren't -- they are a dominant platform and it's at least immoral or an affront to Enlightenment ideals to selectively limit from speech they disagree with based on political views.