Try using Cloudflare R2 with zero egress and you'll rapidly discover there are lots of 'gotchas'... - Want to use a cloudflare managed domain - pay for egress if you have enterprise account - Want to use their 'dev' domain - rate limited

It's still a good service - but zero egress comes with conditions. The only exception I've found is Cloudflare pages which seems genuinely zero egress (as long as you don't proxy it through a managed domain).