All the other suggestions of malice are rather inefficient, especially considering the net value is lower than the cost to push those malicious actions.
As for the reporting: yeah, it seems rather dumb there is no easy to reach form for this, but you can message their abuse address and NOC which are listed in the WHOIS you probably queried anyway to find out Cloudflare owns those addresses:
RNOCHandle: NOC11962-ARIN
RNOCName: NOC
RNOCPhone: +1-650-319-8930
RNOCEmail: noc@cloudflare.com
RNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN
RAbuseHandle: ABUSE2916-ARIN
RAbuseName: Abuse
RAbusePhone: +1-650-319-8930
RAbuseEmail: abuse@cloudflare.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN
A phone call might be quicker if you're really curious about what is happening.