Reddit has been known to be quite susceptible to shills for sometime. It is a source of both fake news and swayed opinion in favor of whoever has the most money to throw at it. I'm not saying that other places are immune to this, but the problems with reddit are actually very well documented, and management seems not to care. It's even possible they are shilling themselves.
Also, reddit has changed comments before, or their CEO has. They have probably also banned people for less than transparent reasons.
Twitter is even worse with their shadow banning, and limiting viewership of twitter accounts, censorship of mainstream conservatives, while notably not censoring known terrorist accounts.
Youtube is known for allowing pedophilia posts, but having conservative politics also gets people banned.
I like mastodon, but I haven't used it enough yet to have a real opinion.
Also scuttblebutt (https://www.scuttlebutt.nz/) looks very promising but has made little real progress into mainstream as of yet.
Just a point of clarity - I am registered green party, but I don't think you can have true democracy with media manipulation.
