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Yes! Nop is currently free and, at this time, there's no plan to introduce a billing plan.
We use your domain for two reasons: the first one is a security reason, we match it with the token; the second reason is to correctly match the URLs to check for overlaps.
We do not store any sensitive data. We MD5 encrypt the page URL to check for collisions, therefore we will never know or store any clear data.
No. Nop is a client-side solution (for now), therefore we provide the UX only to prevent that. You should definitely add a server-side check to be 100% sure.