I owned a small business that did almost nothing about 10 years so I could brag about having one and tell my grandpa about it so he would get off my case.
It's not terribly hard to set up, just a few days of googling, send a few forms, they get authorized, and a bank visit.
None of that costed much either.
The only thing I remember costing anything was a little PO box I rented for $90 a year so I didn't have to have my business as public record at my house because I lived in the hood at the time and thought my neighbors would rob me.
My goal for my business was always to break $90 and stay below any complicated tax numbers once you make too much, but I was never at risk for that. Once you start making enough it's worth it to pay for tax advice otherwise a small slip up, and the IRS will fuck your shit up forever and ever.
Anyway. It's not impressive to be a business owner at all and some people like to keep that secret, but I suspect the author of the comic was just ignorant. It means you can find and fill out forms.
I could be the proud owner of "The Shitposters Co" within a few weeks if I wanted lel