Earlier quoted context omitted.
Well, the argument is that if you don't like eBay it's easy to just go make your own. I'm not disagreeing with that. I'm just assuming that part of "making your own" is getting the other users to sign up, since an auction site with no one to bid isn't very useful. So it's the same with ISPs: if you don't like it just make your own.
You cannot make your own ISP. You can make your own eBay. There is no competition for Comcast, there is for eBay. It appears your very premise is flawed but I welcome you to demonstrate why this isn't true.
It won't be that great, because he wants to share pictures of his kids and I want to sell my funko pops, but it's definitely easy. Unless your definition of an ISP inherently includes a connection to millions of people, in which case I don't understand why your definition of an eBay doesn't as well?