"who exactly is deciding what is and isn't misinformation?"
My vote is fact checkers. I would go to a source that censors posts that fact checkers have determined to be false or misleading. I want a site that employs fact checkers to censor postings that are factually inaccurate.
I have responded to posts here to refute false claims or claims not supported by evidence.
What is needed is a place where only people who speak the truth have a voice. A place where posting false and misleading information will get you banned.
Not interested in rumors, editorials, opinions or speculation. A place where people present evidence and let the readers come to their own conclusions. I would pay a subscription for such a site. I pay for a subscription here. If something is free, you get what you pay for.
TEK