if any of these startups succeed, my condolences to the engineers who get hired afterwards and are stuck bugfixing
This is any successful startup - you don't succeed by making a perfect product, you succeed by making a buggy mess that's enough to convince both investors and more importantly customers that there's potential... That means you need to rebuild from scratch in years 2-4 anyway, so frankly for the engineers who are coming in then, there's little to no difference