There’s a vocal handful group of people disliking CloudFlare because of their irrelevant “privacy” concern here — you can absolutely use the registrar without using their CDN features. Also, reality check: with CloudFlare’s market reach, there’s zero chance nothing they do online isn’t already MITM’ed already. Having said that, Cloudflare uses their registrar as loss leader, so they give their wholesale price to end users registering, and as such you’ll have the cheapest price available for the domain extensions they support. You can then just set your DNS without their orange cloud and traffic on your domain aren’t going to flow through their CDN.