They know what you put in the registration form, every device and IP address you've ever used, who your friends are, who you parents are, who your coworkers are, what websites you visit, what stores you shop at, who you're likely to vote for, and a whole lot more.
I think they can verify my identity without a copy of my driver license.
True. But I wouldn't be surprised to see additional verification required for new Facebook accounts (or those with little to no history/network) to use Libra. We shall see.
Can Facebook comply with KYC/AML type regulations? Yes. But that I'm aware of, they currently don't do anything of the sort with all their users.