On a different Lemmy board I usually serve users with a temporary ban for “Hit&Run”. While it’s not explicitly against the rules to delete one’s own posts, removing content once a few answers have been provided seems very selfish, it’s not fair to the ones who reply and want to read a full thread, and it’s especially infuriating to the ones who write a lengthy reply only to find out after the fact that nobody will read it. It goes against the spirit of the community in general and it’s really annoying at best.