So many people have sketchy TV boxes or whatever other sketchy IOT decice that is a larp for using your network to sell bandwidth to proxy networks.
However, CF is unnecessarily making people on 5G connections from desktops do turnstiles as it looks like a scraper using a mobile proxy. This will become more and more of an issue as more laptops have 5G modems in them. Not sute how this WAF IP fingerprinting model survives widesprear CGNAT. I guess it will be an excuse to more intensly fingerprint us.
What makes you think this is the cause, rather than something more straightforward like: CGNAT means more users are sharing IPs, and there's a higher chance that the IP pool gets contaminated by bad behavior? Apparently cloudflare tries to detect CGNAT pools and give them more leeway, but at the same time they can't give them unlimited leeway.
[1] https://blog.cloudflare.com/detecting-cgn-to-reduce-collater...
Maybe from your IP block even. More common since you don't control that.