We'll support 224 TLDs at launch! Full list here:
https://www.cloudflare.com/tld-policies/
And you'll be able to redact your personal information from Whois with us, too.
It's not surprising, dealing with all the various registries (especially for ccTLDs) is probably one of the harder things to scale when spinning up a new registrar. Even Amazon Route53 uses resellers for some TLDs.