Many things that you describe could be fixed - nitpicking, non-technical people getting frustrated with bugs, poor feedback, burnout, feeling like you cannot work with a team lead.... those things happen, and can be fixed, with effort.

But is this team worth that effort? If you have been working at this for "a few years", and the company is still early stage, that is a bad sign. If the founders and team lead cannot solve the problems, that is a bad sign. If you created a solution that can make millions, but it isn't doing so, then the team doesn't know what to do with it. Another bad sign.

But those bad signs could also be poor interpretations of events, distorted by your own burnout.

My advice is to really think about whether you respect this team enough to work through problems with them. Are your complaints really about them, or just reflections of your own frustrations?

And then, depending on that answer, either sit down and tell them your frustrations and ask them to figure out a path to a healthier working relationship.... or walk out.