Isn’t this also the plot to the frighteners?

He initially uses his new abilities to befriend ghosts, whom he sends to haunt people so that he can charge them handsome fees for "exorcising" the ghosts.

https://en.wikipedia.org/wiki/The_Frighteners

This is the plot of the movie "The Frighteners" which is really rather funny

Anti-virus software.

Makes me think of The Amazing Maurice.

This is how exterminators work irl.

I had to read it twice before I figured out it had nothing to do with Pac-Man.