@gigi There's no oversight on what they must do when we ask them to delete our data. At the very least, they just hide it from you (but not from themselves or their 3,647 sponsors). Or they can refuse to delete it. Or maybe they do delete it, but they don't touch the pile of server backups from the last decade. The practice is entirely unregulated here.
Once you give an American company (tech or otherwise) your information, they're pretty much allowed to do whatever the heck they please with it, in perpetuity, without your consent, unless they spell out otherwise in legal terms.