Thinking about what Mosseri said introducing Threads search:

…having a comprehensive list of every post with a specific word in chronological order inevitably means spammers and other bad actors pummel the view with content by simply adding the relevant words or tags. And before you ask why we don’t take down that bad content, understand there’s a lot more content that people don’t want to see than we can or should take down.

This is what we’ve always thought at Micro.blog too. Meta solves it with algorithmic timelines. We don’t do that, so we’ve been admittedly slow to improve here.