Both @Soblow and i run iocaine, and we have a year-long backlog of URLs that iocaine gave to bots that contain a "poison" word. When we detect that word in a URL, instead of feeding garbage, we redirect to the other's site, trapping them in a Crawler Death Spiral.
This allows us to correlate and track bot operators across time and IPs, because a surprising number of them actually provide Referrer correctly.
@SharpLimefox@Soblow i remember curl having like a redirect limit of 30, do some IPs like drop the connection after like 30 rounds of being ping pong'd around?