Its trivial to run Invidious through a VPN via Gluetun if you use Docker.
When I'm on Invidious, all my requests come from one of Proton's IP addresses, amongst everyone else using YouTube on that Proton server. I'm not logged into YouTube and Google cannot load their ads, trackers and other spyware in my browser.
All they have to go on is the Proton IP, searches, and watched videos
Ah, my girlfriend's approach. No matter how much I show her a pwned password or set her up on my Vaultwarden, she's not interested