I have no idea, but to me the opposite of good commercial games is the point here. What is not to love about a title such as mediocre tetris: https://www.pygame.org/project/5421/7844

This is cheating, but renpy is based on pygame. So tons of visual novels are technically made in pygame, the most popular is probably Doki Doki Literature Club.

This comes to mind: https://store.steampowered.com/app/951360

I have heard that "Unity of Command", the WW2 themed wargame was built in pygame.