Agreed, but DMPs aren't perfect, they aren't considered source of truth, and are used largely for targeting for advertising. However in this case there can be serious implications outside of simply advertising and the data integrity issues with DMPs now begins to lessen.

To add to this, with the argument of fighting terrorism, since a while Governments around the world have been requiring phone numbers to be only given to people who identify themselves by their government issued ID.

And guess what Facebook etc. are requiring at login. Phone numbers. For security they claim, yet they send spam messages to the number.

If you are giving them your PII to verify your identity, doesn't that means they already have a PII database to compare you against?

Id be pretty shocked if anybody here had a FB account, under a pseudonym, and they actually believed they were keeping their true identity hidden from FB. If you have an account, they know who you are. Verifying your ID is a due diligence on their part to CYA.

How many people, saying they would never give info over to FB, willingly hand it over to the fintechs like Robinhood?