"Just ignore it" doesn't work, psychologically.
Oh, i’m quite sure it does. In fact, it’s a central thing in so much of psychology. The only difference is how you get there. Some people can just ignore and others take more effort.
Lots of people play games while ignoring the achievements.
Many people do - well, did - AoC while ignoring the leaderboard.
I never, in all the years of participating in AoC did take a look at the global leaderboard.
Even before LLMs I knew it was filled with with results faster then you can blink.
So some of us, from gut feeling the vast majority, it was always just for fun. Usually I spent at least until March to finish as much as I did in every year.