Sorry, I understood what you meant. I was trying to say something a bit more subtle, which is to say, I think the reason why Pawoo has lost relevance over time is partly because of the fact that it got defederated a lot early on, and this has probably caused a bit of a downward spiral, broken window theory style. It discourages some legitimate usage of the platform, which inherently increases the ratio of unwanted usage to legitimate usage, which discourages legitimate usage further.
There are other things, too. Pawoo is still somewhat integrated with Pixiv, but I believe they sold it to Russel in 2018 or so (can't recall) off the news of new Japanese regulation regarding social media that they did not want to be involved in. This seemed to be a huge blow as well.
Then there's the fact that for Japanese sites, moderating English-language comments is very hard. The rules and moderation standards would ideally be kept consistent between languages, but this requires somehow both good communication with moderators and also moderators that speak fluent English. I doubt there is much proactive moderation of English content on Pixiv/Pawoo/Misskey/etc., and the majority of it is probably mostly ignored by Japanese users of the platform anyway. It's not like Twitter isn't full of a lot of the same stuff, especially since Twitter suspensions are treated as a joke or at worst annoyance by the majority of the userbase. (And honestly, it is also unclear to me that Japanese users would overwhelmingly be in favor of moderating text comments that express illicit interests anyway, so as long as the text itself isn't somehow illicit. This could be a blatant mischaracterization but they seem to err on the side of less restrictions to speech in general when it's in the gray area.)
There are other things, too. Pawoo is still somewhat integrated with Pixiv, but I believe they sold it to Russel in 2018 or so (can't recall) off the news of new Japanese regulation regarding social media that they did not want to be involved in. This seemed to be a huge blow as well.
Then there's the fact that for Japanese sites, moderating English-language comments is very hard. The rules and moderation standards would ideally be kept consistent between languages, but this requires somehow both good communication with moderators and also moderators that speak fluent English. I doubt there is much proactive moderation of English content on Pixiv/Pawoo/Misskey/etc., and the majority of it is probably mostly ignored by Japanese users of the platform anyway. It's not like Twitter isn't full of a lot of the same stuff, especially since Twitter suspensions are treated as a joke or at worst annoyance by the majority of the userbase. (And honestly, it is also unclear to me that Japanese users would overwhelmingly be in favor of moderating text comments that express illicit interests anyway, so as long as the text itself isn't somehow illicit. This could be a blatant mischaracterization but they seem to err on the side of less restrictions to speech in general when it's in the gray area.)