We've seen wikileaks deplatformed and there are many more instances that don't come with a legal power.
Not hard to imagine the same happening to "a platform promoting dangerous misinformation" as is the justification from YouTube.
But that's actually predictable. Banking is built on trust. Trust is a societal construct. "It's hard to open my porn shop because the banks won't give me a loan and the town won't zone for it" is an issue older than the Internet.