You're taking it as a premise that someone should have this power, i.e. that the centralization should actually exist.
Compare two alternatives.
One, each person has (is required to have) a single account across all services. You use the same account for the DMV, YouTube, your bank and the IRS.
Two, you have an independent account for each service. You have separate accounts with the IRS, Medicare, DMV, YouTube, etc. If one of them gets messed up or compromised it doesn't affect the others. If you have a dispute with any of them it limits the blast radius.
The first one is a dystopia regardless of who controls the single account. It's subject to abuse of power whether it's a politician or Mark Zuckerberg. So the solution is to demand the second one.