Sounds like a dream job or a nice side gig if you just want a job. Login, run script, log out, bill for thousands, then go back to doing your own thing.

Intentionally withholding stuff without offering an upfront option is shady though.

I remember this guy that automated his own job while working on distance... In the end he had a full time job automated into a couple of hours a month. https://workplace.stackexchange.com/questions/93696/is-it-un...

Where do you draw the line? My grandma was once contacted by a scammer who offered to "optimize" her laptop, and she ended up paying roughly the same as the price of a new laptop.

Yeah, that's in fact a good test for whether your work might be unethical - if you're relying on information arbitrage, you're screwing someone over.