And some perspective: mods have been banning 1-2 thousand users per week recently. According to the OP there were ~30 appeal threads in ~ half a week, including bumps of older threads from before. Could be worse.
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1-2k bans per week – damn it... it’s quite a lot - they have really lot of work…
But this is what Meta is for: forum-based issues, and that's what a banned account falls under. It's even in the rules that banned users can only post in here. I don't think we need a new sub for this, especially as Meta would be pretty empty without them
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Once again: no one wants to throw these threads out of meta board just to move them child board – I understand a child board as a part of main board just more specialized in a specific matter.
I wouldn’t also worry that meta would be empty without them. I gave the idea for consideration, because there are really lot of such threads (tens a week) but there are still not more than 15%-25% of all meta threads so there would still many threads left in main board, so I’m sure so it would not become inactive nor dead.
The description of meta bard is “Discussion about the Bitcoin Forum” what I see much wider than “Discussion about specific users complains”, more like place to discuss about forum like the whole – its rules, ranks, stats, inconveniences, possible facilities etc... where specific users issues are treated more like examples than main point of focus...