Unrelated but I went to the linked website, then a while later to Youtube and now I'm getting videos recommended about the Gemini protocol that I have never heard of before today.

I'm on Arc and use uBlock Origin Lite, NextDNS, if I had searched I would have used Kagi. How do they (Google) know?

EDIT: I'm not implying that the gemini project is doing anything wrong here

The prediction algorithms are so good that indirect behaviors and data can be informative.

You might also be profiled by Google and bucketed into a group of similar people who leak their data. They also went to this website and their YT recommendations became a signal to inform your own.

Not claiming any certainty here just possible ideas.

They aren't necessarily tracking you personally. Gemini Protocol hitting the front page of HN means a spike in interest generally, which the YouTube algorithm could be reacting to in aggregate.