They were asking about a proxy, not a frontend. Like, invidious and piped are YouTube frontends, but both of them has a proxy feature, always-on with piped, which makes the frontend proxy all requests (even video segments) through the server of your choice.
So with a proxy service, google will not see your IP, unless the proxy you use is a mole.
Even when using open source alternatives the server know your IP and you don’t know what they are going to do.
They were asking about a proxy, not a frontend. Like, invidious and piped are YouTube frontends, but both of them has a proxy feature, always-on with piped, which makes the frontend proxy all requests (even video segments) through the server of your choice.
So with a proxy service, google will not see your IP, unless the proxy you use is a mole.