Too bad they don’t support custom name servers.
> Too bad they don’t support custom name servers. Do they not? https://developers.cloudflare.com/dns/additional-options/cus...
What you cannot do is set your domain's nameservers to some other other provider, e.g. Route53. There's just no option to tell the registry you want to use non-CloudFlare backed values (outside of "call us" enterprise plans).
This is particularly nefarious when combined with buying a new domain. New domains can't be transferred to another registrar for 60 days, so if you need a DNS feature or config CloudFlare can't provide on a domain you just bought, you're just totally stuck for 2 months.