The script won’t work without a proxy, but if privacy is important to you, you can host your own and replace the default proxies with it. Your own proxy would require a verified YouTube account though, so it kind of defeats the purpose if you were trying to avoid creating such an account in the first place.

Been using that one for years without any problems. Users should be aware though that it uses third party proxies by default that could potentially log which age restricted videos you’re watching.