I'm not claiming I have the answer, but I feel that the vague "omg youtube is a platform so it should allow all my videos!!!!" argument is extremely reductive, and tends to imply that it should just be this total anarchy of a platform. If YouTube doesn't regulate their content, it's going to be hard to find advertisers, and if they can't find advertisers it will be hard to monetize the platform.
[1] Obviously legal stuff, porn that's outright illegal should of course not be allowed.
Online video sites are in no way, shape, or form, a town square. They are privately-managed, there is no practical scarcity on how many video sites can exist, and if you don't like YouTube's policies, you and your viewers can easily go elsewhere. Indeed, platforms like BitChute exist in large part to host channels that YouTube has banned.
By moving away from YouTube, you'd obviously lose YouTube's viewers and advertisers, and that may make your video channel infeasible if you're running it for-profit. But them's the breaks -- you're not entitled to another company's audience.