What they're objecting to, is that their audience continues to exist, and YouTube and other tech companies are throwing up barriers between them and their existing audience -- even to the point of refusing to process payments and otherwise doing things which look like possibly illegal collusion between companies.
YouTube has captured the mainstream of all vlog commentary across all society, but they insist that they can continue to act like they're just a niche tech player. It's no different than a company in 1985 that had owned 85% of all the TV stations and Newspapers in the US. At some point, media companies get too big and too dominant over human discourse. At some point, media companies can get big enough to become a threat to Free Speech.
Plus, the people bitching about their content removed from youtube don't want to just be able to upload to youtube they want youtube's audience, they in fact think they're entitled to youtube's audience.