I didn't read computer science. So my advise will be general in nature. If you've have gone this far already, i will advise, you try and finish it. Unless you intend to launch your own stuff since or are happy to work with only startups, otherwise get the degree. Also if you are sure that at the psychological level it won't affect you impression of who you are, then you can skip it. The richest men in the world do not have degrees but they are entrepreneurs. So if you won't finish the degree, do you own start-up, working for another man's start-up is fine until you get layed off or it tanks. Investors can push you off managing a start-up where you are a co-founder if it takes off, but your stock remains. So you don't loose out in thesame manner a sacked employee does.
But then if the startup you are in succeeds and you are still with them at that point,then you you might not need a degree. But the time it would take it to succeed is sufficient for you to also finish your degree. My advise keep combining both. Switch to maths since you are already a good programmer and have done CS for a number of years.
On a final note, a degree doesn't guarantee anything but could be a fall back position if everything else fails ie startups, consulting gigs etc. A degree only gives you the possibilities to live an average life. No guarantees to a good or fulfilled life. So understand its worth.
But then if the startup you are in succeeds and you are still with them at that point,then you you might not need a degree. But the time it would take it to succeed is sufficient for you to also finish your degree. My advise keep combining both. Switch to maths since you are already a good programmer and have done CS for a number of years.
On a final note, a degree doesn't guarantee anything but could be a fall back position if everything else fails ie startups, consulting gigs etc. A degree only gives you the possibilities to live an average life. No guarantees to a good or fulfilled life. So understand its worth.