The problem with Alternative Platforms is they are often first used by people that have been banned by main stream platforms
It is sad we have come to the point that people "will not touch" a platform because there are others on their which they disagree with, or even find offensive.
It is easy to defend the speech of people you agree with, it take someone of strong ethical convictions to understand that in order to actually have free speech, the speech we find offensive must also be permitted.
Much of the original content on YT, that made YT popular would be banned under the terms YT operates under today. If you apply these conditions to potential replacements for YT then no replacements are possible