It'd be interesting to see how that works in various languages, because there may be some selection bias. Most English-speaking countries have decent protections for all but the most abhorrent speech, and people who don't find their speech constrained may not bother with anonymous platforms. In non-democratic countries with more restrictions on political speech, maybe we'd find anonymous platforms full of pro-democracy dissidents.
Maybe something that would help these platforms is some kind of distributed or federated moderation, so you can avoid the icky stuff yourself even if it's still out there.
Maybe something that would help these platforms is some kind of distributed or federated moderation, so you can avoid the icky stuff yourself even if it's still out there.