Not as an employee, but I co-founded a startup with a friend. We were friends since college and he had come up with a good idea, and insisted I should help him

Not as an employee, but I co-founded a startup with a friend. We were friends since college and he had come up with a good idea, and insisted I should help him build the product. He was a non-tech guy so I built the whole thing and we made some good money. Fast forwarding 2 years, the numbers started going down and he started looking for alternative ways to increase our income and came up with crazy projects that we failed to deliver. Ideas like building a video generation engine for product marketing. We only had two junior devs at that time... At the end, he tried screwing me over legally. Fortunately, I had a good lawyer and left the company at the right time with my pockets full.