Here's such a conversation with an admin at sh.itjust.works if you are interested: https://sh.itjust.works/comment/12051373, or with the mod of traditional_art@lemmy.ml https://discuss.online/post/12722075/11762479, and ofc there are many more. One conversation at a time, bringing up the logical points, condensing them, helping people know their options, etc.

blocking them is still one click away

Not... entirely, but yes an entire section dedicated to "hardcore tankies" helps!:-) I suppose that helps more for people brought in via Reddit, but not word-of-mouth recommendations, so if I am speaking of the latter then the burden is on me, and upon everyone else doing likewise, to "warn" their irl friends that they recommend to take a look at Lemmy. Which is why I am saying that it would be good to add automated labels. I think we are still waiting for a Lemmy upgrade though, that would allow for those? Or perhaps people are waiting specifically for 0.19.6 when Lemmy.World will upgrade, leading the way.

Lemmy.World naively might seem the most likely to attach a warning label to Lemmy.ml communities, seeing as e.g. they have defederated entirely from Hexbear.net, whereas so many other instances do not even do that much.

Though for myself, the longer this goes on the less faith I have that it will ever be fixed whilst remaining dependent upon the Lemmy.ml + lemmygrad.ml admins & devs to help accomplish the goals of bringing in more mainstream normies from the Western civilization that they so abhor and constantly ridicule. Why should they? They themselves do not want that. It is a harsh truth but we are on their platform, and that's that. We will receive what they deign to offer. Which is why I am trying now to help PieFed thrive, despite how far behind it is, and it would be great to see Sublinks arrive as well.

I feel like we've had this conversation two or three times in the last few weeks

You keep asking questions though... so I kept answering them:-P. I feel like we got some addditional clarity on your only focusing on the top 20 instances.

Little by little, progress is made. This issue is not entirely solvable though, using current methods available to us - e.g. the issue you mentioned that the desires of users to avoid being bullied are at cross-purposes with being able to access particularly the FOSS content such as !firefox@lemmy.ml. I will say that "accessing open source communities" isn't terribly hard - you don't even need an account for that, though indeed lacking one would cut someone off from participating by asking questions, posting, replying, and voting. Which is why something like a "community label" holds such appeal to me, and even more approaches such as PieFed's ability to enact user-initated user-blocking of custom user-specified instances without the need for the approval of an entire admin team and thereby the support of an entire community. It thereby democracizes blocking, making it available to anyone who wants it, which I for one think is awesome!?:-) Though the UI needs some polish, so I will focus on submitting bug reports to help with that.