Well, there are other places to host videos, but there's nowhere to spread misinformation videos quite as efficiently as on YouTube.
It's not enough to simply be able to upload videos, you need a platform that's happy to push your bullshit onto a large audience of vulnerable viewers, desperate enough to keep them consuming content on the platform that they don't give a shit about moral bankruptcy. YouTube has played that role amazingly for at least a decade now, and it's not going to be easy to replace if they should suddenly start giving a fuck.