After leaving Kbin (for unrelated reasons), where those spaces are blocked by default, I started to wonder if I should leave Lemmy, then realized it was not all that way but only certain spaces, easily blocked ever since 0.19.3. (Reddit had become virtually all that way, so it was making sense to me to think that social media was just becoming that way in general.)

However, saying the names of those spaces out loud is likely to trigger removal by a mod.

This is a real problem for wanting the Fediverse to grow in the future, as unsuspecting new people see that and - the sane ones anyway - don’t want any part of it. Every one of us, unless we were warned, learned the hard way about “those places”. By ignoring the issues, e.g. by leaving it up to each individual user to block those instances, we allow this situation to perpetuate. I for one think it would be far friendlier to block any instance where there is a >75% chance that a new user would be not merely downvoted but outright insulted and make such communities opt-in rather than the current situation of needing to first detect which ones are that way and then opt-out of each one individually.