That's new, there have been some really infamous examples of devs burning customers, [ex. Faulty Apprentice NSFW (separate project from the still existing one which used to be the vanilla version)].
Glad they are at least trying to talk devs out of pulling that now, though the last I saw (which i'll admit was a while back) the itch dev tos was worded such that they specifically allow devs to delete everything even with customers.