[recuter]

"Cloudflare Registrar is only available for customers that use Cloudflare as their authoritative DNS provider (also known as a full setup)."

Wow. Just wow. What happens if I register a domain via Cloudflare but decide later I don't want to use their DNS offerings?

[bombcar]

You transfer it, hoping that they don't refuse and decide they own you forever.

[jgrahamc]

You can transfer the domain to some other registrar.