I understand perfectly what you're saying. Your gonna spend a fortune setting up your own ISP to try and avoid certain laws. Your ISP would fall into the same regulations as all the others.
No you don't.
I would set up my own ISP (how much that would cost I dunno know but it would only be for me and not have an office or customer service dept etc) to protect myself from court orders that will only be ever taken out against the big ISPs, like, but not specifically, the court orders on Sky, Everything Everywhere, TalkTalk, O2 and Virgin Media and now BT saying they must block certain sites.
There is nothing illegal about any ISP not named above not blocking TPB for example because as I keep having to tell you it's not a 'law'. Then any new laws that are brought in would be irrelevant as I'd be my the person monitoring me not some corporation.
Other advantages would be dedicated fibre line, no download limits ever, no changes to my service or prices, potentially no 'contention ratio' etc etc.
Remember this is a fantasy hypothetical if I had £120 million, not something I'm planning to do next week. It would a principle thing so there's no point trying to monetise reasons why I'd be stupid to do it.