the truth is that these tech co-founders are really looking for a playground to have fun with code/tech, the same way a kid wants to play lego.

Building a business is not fun at all. There are tonnes of mundane stuff, and these are fairly important. A technical co-founder is quite likely to have quit their previou job because they want to create an environment where they aren't restricted by the "business people" for doing technical exploration and play.

This is why i think finding a business partner who isn't technical is quite important. They can reign you back in.