I've got a treat for you, cloudflare's business model moved heavily towards crime as a service during the last decades, including DDoS botnets that host their own CnCs behind cloudflare, while themselves even relaying cloudflare DNS data to DDoS cloudflare instances itself.
The guy behind Crimeflare, when it was still available, tried to accumulate a dataset by running his own resolver, which filtered out domains in the zones of cloudflare's known ASNs.
This was actually also part of a lawsuit against lieferando (takeaway) because they're registering domains of restaurant owners and blackmail them into using their delivery service, after they already registered the Google business entry with that cloudflare domain to a call center of Takeaway, so the actual owner of that restaurant has no chance in terms of SEO and google searches that people would find them again.
The guy behind Crimeflare, when it was still available, tried to accumulate a dataset by running his own resolver, which filtered out domains in the zones of cloudflare's known ASNs.
This was actually also part of a lawsuit against lieferando (takeaway) because they're registering domains of restaurant owners and blackmail them into using their delivery service, after they already registered the Google business entry with that cloudflare domain to a call center of Takeaway, so the actual owner of that restaurant has no chance in terms of SEO and google searches that people would find them again.
Anyways, the dataset is pretty fascinating:
[1] https://web.archive.org/web/20210826102143/http://www.crimef...
[2] https://web.archive.org/web/20210826103036/http://www.crimef...