Anonymity is anathema to the government. There are plenty of laws on the books prohibiting it even if you're not committing any other crimes: many locations (most? all?) ban wearing masks at legal, peaceful public protests, even if the protesters have legitimate reasons to fear employer or community reprisal for participating in the protest.
That's because State Power is not, contra popular imagination, based on a monopoly of violence, which only exists nowadays thanks to the triumph of its real source. It's based on legibility: by abstracting the world and identifying and naming its subsystems, the State creates its own power. Naming and identifying people is a natural part of that: indeed, adding last names to a first name to create a (ostensibly) unique global identifier was one of the first projects of the modern State. One hundred faceless people you have to monitor at the moment is far more dangerous than a thousand identified people you can attack after the fact.
That's because State Power is not, contra popular imagination, based on a monopoly of violence, which only exists nowadays thanks to the triumph of its real source. It's based on legibility: by abstracting the world and identifying and naming its subsystems, the State creates its own power. Naming and identifying people is a natural part of that: indeed, adding last names to a first name to create a (ostensibly) unique global identifier was one of the first projects of the modern State. One hundred faceless people you have to monitor at the moment is far more dangerous than a thousand identified people you can attack after the fact.