Yes, constructed the honeypot URL using the proxy site and called it (thousands of times) so I can get them to fetch it from my server through their IP so I can log it.
They literally proxy your website? I thought they'd cache it... that makes more sense now in your statement that you hit their website with a specially formatted url. Since they pass that through to you you can filter on that.
Also: since you say 4k-5k IPs... any of them from cloud providers? And specific location?
There is also the potential to use it as a watering hole for more sophisticated or subversive measures where they subtly change what you post to promote something you don't actually promote (so at some point they deviate from pure proxy to mitm).
I didn't do it as a super quick burst, but in a space of multiple hours.
First because the proxy servers were super slow and second - I couldn't automate it - their servers had some kind of bot detection which would catch me calling the URLs through script.
Instead, I installed a browser extension which would automatically reload a browser tab after specified timeout (I've set it to 10 sec or something) and I opened like 50 tabs of the honeypot URL and left it there to reload for hours ...
Also: since you say 4k-5k IPs... any of them from cloud providers? And specific location?