A good part of DIY ISP don't have customers, they have users, it's a major difference, they are made by the people for the people. It really depends on the cou

A good part of DIY ISP don't have customers, they have users, it's a major difference, they are made by the people for the people. It really depends on the country where you want to do that, but, generally, it's hard and expensive to setup a traditional (think *DSL, FTTH) ISP.