Or you start small and grow.
Or you borrow money to start.
Or you find an angel investor who is rich.
Etc.
Kind of like any other start up really.
If you can get business loans and financing, that's just another version of not exactlty being poor.
They run 3rd party apps on their phones which automate whole process and they get some percent of profit. I imagine that when they grow they can start working for themselves.
The people who are good at spam - the folks topping Google search results for lucrative phrases or spamming social media on an industrial scale - all tend to have a lot of money.
A business built on spam (or illegal tactics) is, by nature, unstable. You're one bust away from losing all your income.
So the people who enter this space either tend to have so much money that they don't mind losing an income source. Or they have so little money that they spam in desperation
Even if they weren't trying to BS you, people committing crimes often come up with some sort of story to justify the whole thing. People like to be the hero of their story.