Assign unique, easy-to-remember (perhaps AI-generated) graphic to each account at creation. Think nature-scene, or modern art piece.

Prohibit change after account creation.

Force use of said graphic when no photo is offered, perhaps even make it a pic that can't be unshared.

Make it easier to detect time wasters, so you needn't spend an hour typing to realize you are once again communicating with amorphous blob that your brain still has no visual reference for....