Comment by tinglymintyfrsh

Right observation, but wrong conclusion.

Cloudflare skews towards a monopolistic monoculture. (Fastly and Akamai also exist, but present more friction.)

The issue is that with one transparent proxy and application firewall for a large fraction of web traffic, it has to cover uncountable edge-cases to not leave out nonzero users from a large number of sites. It's unlikely to be malicious intention here, but more likely accidents, oversights, and lack of alternatives.