[DukeBaset]

Perhaps the app itself can use ml to detect flag and prevent known images from being sent...

[fogihujy]

"Why is Whatsapp using up my phone's battery?"

[brokenmachine]

I'm opposed to this on other grounds, but computing and checking a single hash for each image wouldn't be that big a burden.

[fogihujy]

Agreed. You mentioned ML though, and that's a different matter.

Checking hashes is definitely viable, but only works for known good examples.