Or how would you decide?
I'm of the opinion that if A, B, C and D are alts, even if only A and C are found to have scammed, then I'll give A, B, C and D Red Paint TM for being alts of each-other who are known to have scammed.
I started this thread a while ago, some comments worth considering:
When leaving trust for known Alt's of other users feel free to vote too)
Thanks, I've submitted my vote.

I agree that all accounts should be tagged if it's proven that they are scammers and connected. But the issue between sham100899, hisori and fakegurutu is, that we have only a clear evidence (BTC-address) for sham100899 and hisori but no real clear evidence to tag fakegurutu.
And I did some more research:
Both accounts edited their messages 30 minutes later:
originally posted:
sham100899: January 22, 2019, 03:01:52 AM
fakegurutu: January 22, 2019, 03:06:36 AM
less than 5 minutes difference
last edited:
sham100899: January 22, 2019, 03:34:39 AM
fakegurutu: January 22, 2019, 03:33:45 AM
less than 1 minute difference