While I don't disagree with your argument per se (not sure if I quite agree either, though), note that avoiding a decentralised platform because of being "worried about the consequences" is not necessarily the same thing as worrying that "the content (..) is content they don't find too offensive".

The first includes both legal and moral considerations, the second only moral ones.

My consideration of whether to share, part of the time, some slice of my home Internet connection bandwidth as a Tor exit node is almost entirely a legal one (I admit that time/effort may play a role too). I'd consider the moral aspect too, but I wouldn't have to think long to decide that (for me personally) the trade-offs are worth it (I could explain why and how, but I don't want to derail the discussion in that direction).

In fact I'd argue this goes for anyone, in some sense. Even if their underlying reasons align with the legal considerations (and thus not run one), it's a moral judgement. (in the worst case, there exist people who equate moral judgement with legality)