[asdgagbiobnio]

You don't have to formally quit the game to stop playing. I played one ranked chess tournament in high school, quit for ten years, and then picked it back up. What would you do with my points?

If you choose to delete them, that means that everyone will have constantly eroding ratings unless they keep playing.

[chongli]

Your points could be added back in when you resume playing. There’s no reason to throw the data away.