I assume its my IP's reputation, or that of my entire ISP/ASN. As far as i can tell I dont have a residential proxy, but I cant make those same guarantees about nearby IPs.

I do use firefox with third party cookies disabled + ublock origin, but thats on my desktop. I actually see the cloudflare popups more often on my latest-iOS iPhone in stock safari with whatever minimal tracking protection is built in. Not on a VPN, and not using iCloud public relay either. Its very frustrating.