Commerce, people conducting business want to conclude it and FOMO, ordinals (a sort of on chain layer 2) degenerates want to make sure they get their trinket, token, or jpeg. The next block may also have high fees, too. As fees peak people have to bump their fee with RBF or CPFP or wait a very long time for the fee market or die down. In general, high fees are a positive sign that bitcoin interest and utility is increasing.