I know I'm gonna get shit for this, but I'm someone who always tries to be fair and look at things from all sides so...
I suspect like many things in late stage capitalism, for at least some not insignificant portion of them, it's not much of a choice. I'll lay odds a good number have a hard time getting jobs that pay worth a damn. I wouldn't be surprised if many were ex-cons, for example - which is why they're encouraged to wear masks, because those in charge don't want to allow that fact to be used to "de-legitimize" what they're doing. The "choice" from the agent's perspective is quite possibly do this, or be homeless & hungry. It's more deliberate cattle-herding of the powerless by those at the top.
I'm sure the majority are probably into the job, but I suspect those that are just doing it for lack of options is not a small percentage.