It's only Cloudflare IPs, its only the most popular reverse proxy and CDN provider on the internet. Only a mere 20%+ of internet traffic traverses via Cloudflare.
It's wrong, but also: just stop centralizing on cloudflare. It's just a glorified proxy, do you really need it, or are you marking an enterprise compliance checkbox?
Not really how it works in practice here, some Cloudflare IPs are unavailable for a few hours, everything mostly keeps working as it always is.