Nice I'm reading the post and is a good way to spot them.
For a bigger ring meh I'm finding tens of accounts using the same wallet 00000dd86b on signatures, I think someone has a lot of accounts there but I have no resources to investigate more, it takes to much time and as always no one pays me to do it, so

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To find rings now a good way is to look on older signatures and see if users are using the same new one signature as a starting point.
I have so many doubts on so many accounts on new signatures currently active on the forum, you have no idea.