Yeah IDK, not my experience I guess... At least for all the hashtags I follow of non-bitcoin interests, almost all of the posts are from Mostr.

There are certain servers that do produce nothing but spam (specifically some weird sort of news-copying sites), but those are pretty easily filtered out.

The problem with Mostr is it's one-way, the other server doesn't hear your comment (99% of the time -- there are weird exceptions). Momostr actually has 2-way communication working, but the operator intentionally crippled discovery. 🤷