Many prisoners file numerous frivolous lawsuits without the aid of a lawyer. They go to the law library in the prison, read up on the process, then just start filing on their own.
They do it because they have a lot of time on their hands, and that is one way to pass the time.
Also, they can file their claims for FREE (most people have to pay a filing fee and other court costs) because they have been deemed by the courts to be indigent.
So there are no financial obstacles to them filing as many claims as they want, for anything they can think of. If the cases get tossed or they lose, it costs them nothing. But if they win, they get something out of it after all. It's win-win for them.