Check their terms.[1] First of all, you're giving them a license to your content for their purposes. "By submitting, posting, or publishing your content, suggestions, enhancement requests, recommendations, feedback, information, data, or comments (“Content”) to any Website or Online Service, you are granting Cloudflare a perpetual, irrevocable, worldwide, non-exclusive, royalty-free right and license (with the right…
> “Websites” refers to www.cloudflare.com, as well as the other websites that Cloudflare operates and that link to these Terms, and (ii) “Online Services” means Cloudflare’s products and services that are publicly available without a subscription or a Cloudflare account, including, but not limited to, the 1.1.1.1 Public DNS Resolver service, including 1.1.1.1 for Families, Cloudflare Time Services, and RPKI Portal.