Cybercrime is helped by the massive amount of static identifiers big tech and the internet uses and their refusal to shift away from them.

Privacy focused solutions prevent the leaks which enable many scammers, and yet governments respond by demanding more identifiers be added everywhere, which perpetuates the leaks. I've not gotten a single spam message on Signal with their phone number privacy settings and username usage. You can change your username whenever you want.

Google should add email aliasing and encourage it. They could detect and alert users if an email that comes to an alias is from a different sender than the first email to that alias.