Based on a similar experience, I would say it's best to leave.
Around a year ago I also left a 8-9 year "startup" with some of the same fundamentals issues but at least we had a basic demo even though it was very insecure. That wasn't the primary reason for me leaving but their attempt at A funding was taking a lot longer then expected and the contract was up.
Interesting enough the company I used to work for was mentioned on hn at one point, but this was many years ago. They changed industries which is understandable.
Around a year ago I also left a 8-9 year "startup" with some of the same fundamentals issues but at least we had a basic demo even though it was very insecure. That wasn't the primary reason for me leaving but their attempt at A funding was taking a lot longer then expected and the contract was up.
Interesting enough the company I used to work for was mentioned on hn at one point, but this was many years ago. They changed industries which is understandable.