You can avoid loading your site in an iframe using headers.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-...
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Co...
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-...
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Co...
Let the whack-a-mole games begin.
Also, web servers should have rate limits set which would make proxying less viable, even for IP ranges.