Two comments
1) If the investor had another idea of how to make the product work, why did that not come up earlier? You should be working &quot;with&quot; your angel investor, not selling your work to him so he can run it.<p>2) You took the wrong lesson from this. &quot;Don&#x27;t even think about building your product&quot; is the wrong mentality. Build it quick and get a few people using it. Figure out what you need to do to get people using it. The MVP for piggybank didn&#x27;t include payments (possibly) or it had something else.<p>The founders here didn&#x27;t find a way to make this product work. It&#x27;s a great idea (I think) and now the first Angel investor is going to take it and make it work because for some strange reason the founders saw the hard road, the one which could break them and destroy their dreams and they decided to run straight into that wall with their eyes closed instead of finding a different route around.