Well if you find unsigned content, you should probably just not show it to the user at all.
replyAs for tagging... We could use something like color to indicate domain. So if your well trusted plumber is giving financial advice maybe it shows up, but not in the "financial" color? Idk it seems like a solvable UX problem.
Anything relying on user recognising some tag colour seems like an unsolvable UX problem to me.
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