Like what? I mean you don’t save cookies/local storage either, or use private browsing always.

At most google see your search terms, results you click and your ip address. Unless you’re using ipv6 without rotation or with unique prefix there is no identifying information.

Google without logging in with ublock is best. No privacy implication, no ads, no ai response.

This can be a soft limit where Youtube limits the connection rate so that artificially inflating view count becomes more costly. There are inexpensive ‘services’ especially in India or Pakistan where you can buy human (like a whole internet cafe) view times to your scam video to make it float in suggestions and to promote a channel.

I don’t work for youtube so it is just a guess.