^^^
he beat me to it but I spent too much time writing this, and my take is slightly different
This is weird. Who's doing this, and for what reason?
As stated by other member, those account actually don't join any signature campaign. So sigban unlikely to make them stop spamming again in the future.
So for the avatar you see above could mean maybe they were once on the signature campaign before or anticipated to be, but are no longer there.
My theory is its a form of link saturation for "passive SEO" purposes. It was probably marketed and sold to Rainbet. I find it highly unlikely anybody would bother buying all these accounts just to do this for free.
Most of the accounts were red tagged before. When they came back they all cranked out similarly
awful posts as they were
all purchased by the same person. The timestamps of the password changes is pretty undeniable.
So even if my theory is wrong, it wouldn't hurt if they didn't have signatures for a couple of years. Is my thinking. Issuing them an actual ban means the signatures stay up forever, if I'm not mistaken.