:)
you don’t have to block all of them at once, just keep blocking everytime you find a new one and eventually they’ll be all gone :)
I don’t think comments from lemmygrad’s users should be a problem since they must follow the community rules. If you find an annoying user just block them, annoying users will exist in any instance, unfortunately
Freetube is still working for me, I recommend give it a try :)