The only downside is that they use Cloudflare DNS behind the scenes, so when Cloudflare goes down, your website goes down too unless you use third-party DNS.
But for end-users not using CF DNS... if the domain used third-party DNS, wouldn't that be enough? Since the TLD servers keep their own mapping of authoritative DNS servers for every domain, it's not asking CF to resolve DNS for your domain.
But for end-users not using CF DNS... if the domain used third-party DNS, wouldn't that be enough? Since the TLD servers keep their own mapping of authoritative DNS servers for every domain, it's not asking CF to resolve DNS for your domain.