A lot of people don’t agree with the whole snapping a rubber band against your wrist as an alternative to self injury… and I totally get it because I was (and in a way sort of still am) one of those people.
Snapping a rubber band against your wrist is still a form of self injury (although I don’t see anyone saying anything about the holding ice cubes in your hands).
But I like to think of it more as a “transitional alternative”. It may not be the healthiest alternative… but it’s a pretty damn good baby step. You’re still self harming, but in a much less dangerous way… and then you take another baby step and move on to an alternative that isn’t a form of self injury at all… and eventually to something that’s a HEALTHY way to cope.
It’s not meant to be a permanent replacement for something like cutting or burning.