I just researched Ello earlier this week to include in my #SamNet talk slide of social networks I joined and left. I remember its manifesto fliers around SF when it launched. I liked the manifesto but only ever posted once on it saying it would need to federate to not fail. Well, took longer than I expected, but it failed.
Fighting CSAM is important. Interoperable digital identification is important. Both can be accomplished in a way that strengthens society without undermining the fundamental human right to privacy. The details matter.