You do if you want legal action. If you want to put the responsibility on the platforms, which is what I do, and want, then you are somewhat accepting the responsibility IS on them. Not so much people seeking for job firing to take over platform moderation.
Without it being a legal matter unfortunately you cannot force a private company. All you can do is stop using them as a means of protest if constantly pressuring them fails. I hate to say this like its some get out of jail card, but Facebook/Twitter/Reddit and YT are not rights. They are not something you NEED to be on or use. I fully understand the rebuttal of how much importance humans put on social media, but what I'm saying doesn't then become false. The fact they are private companies and private services means you are at the mercy of their moderation, and without any legal waters to throw them in, the Government isn't going to force them to start actually honouring their ToS.