Surveillance is the monitoring of one party by another unaware party.

A company surveilling an individual and an individual surveilling a company is the same activity, despite one perhaps having potentially greater resources.

I don't buy the claim that the root word meaning "above" means that we should mean that we need another word with a root word meaning "below" given that a so called "sousveiller" could in fact be recording from a place of advantage. (Either physically above a company or given the potential scheduling freedom of a dedicated and compelled freelancer.

Is it sousveillance if one were to write a script logging every available source of one other who's registered a company and is the soul employee of said company? e.g. If some neckbeard "sousveills" every post of a sex worker that's working for a company they registered for their own tax purposes?

Clearly not. The first might be suurveillance or possibly spying, and the second is clearly stalking.

https://deflock.org/

I'm opposed to public security cameras. No expectation of privacy in public does not mean we should surveil everything in public.