Wouldn't people who are already founders / co-founders probably be too busy to take on any other projects? Or do you mean "has been a founder in the past" as opposed to "currently in the middle of founding something?"
Sorry for not being clear enough — it's not any kind of job post or "I need a cofounder" type thing. I'm a technical founder myself and interested in knowing others like me. The project I reference is/will be my attempt to make sense of the data I collect.
Ah, gotcha. That makes a lot more sense!