That's... not a universal reaction. People still play Chess and Go even though the best AIs for both games are superhuman (and have been for Chess for quite some time now). And for AoC in particular, most people aren't particularly interested in their place on the global leaderboard, and Eric Wastl (who writes the puzzles) is... bemused and a little bit squicked by the people who are. (See, e.g., remarks on "why do AoC" in this talk: https://archive.fosdem.org/2021/schedule/event/adventofcode/)