I've been a solo-founder for 15 years, and I'll admit a co-founder would be awesome. But starting a company is not a walk in the park.. things are going to go wrong. It's not going to go as planned, you're going to feel like quitting at some point... And you have to trust this person you just met to handle that, resolve differences of opinion on the company, etc all while barely knowing how this person behaves under pressure, with their livelihood on the line (or their unrealistic dreams of riches).
It would be some kind of miracle if it actually works out with a random person. I would never do it.