I've worked in a startup that had funding, and a good idea, but the CEO couldn't run a business. He also wouldn't let any of the reigns go to people who COULD run the business, so it was miserable. We'd change directions at least once a week, we'd have him promising customers things that we obviously couldn't deliver, and he'd sign contracts we couldn't honour. He was also abusive to the staff, with the exception of one, who was also incompetent but brown-nosed relentlessly.
If the idea has promise, leave, wait out any non-compete and start again without them. Heck, they may even close down and you'd be free to do as you wish. Or move on if there's no way to do that without being sued into the ground. Life is too short to be miserable at work.
It still feels foolish to walk away, I could probably will this business into some level of revenue. Question is if it’s worth it to me, a liquidity event would be so far away.
Is there a way you can help find some work for them to do? Like, hitting the pavement hard to wrangle up customers?
I dunno, just spitballing!
I'm in a related situation. I've been working for a company for years, and the owner is incompetent in most areas except sales. His original company is over a decade old but now almost dead. Somehow he's still getting investor money and for the past 5 years has been trying to start a new business, but keeps pivoting before anything is actually released to the public. I'm the main dev and it's getting frustrating, but I know without me he definitely won't get anywhere. And the pay vs time invested is pretty good at the moment.
Are they bad at contributing technically? Are they lazy? Are they bullish on bad decisions? Do they not listen to input? Are they reckless? Are they overly optimistic? Are they morally dubious? I've yet to meet a founder-type that didn't exhibit at least one (often two) of those traits.
You might balk at this, but since you’re at the cofounder/lead level, you already have the power to make real change. Lead this other person, support them, don’t do their job for them. You likely need to “teach them to fish” so to speak.
There are some tough conversations and boundary setting you likely need to do. It’s going to be hard, because the other party is used to the way things are. If you hang in there, stay patient, and focus on maintaining a positive, growing relationship, to have a good chance of succeeding though.
This weakness you perceive in your peer is an opportunity for growth if you look at it the right way.
Most things in life are about relationship management. Without it, the overall endeavour fails.
Basically set boundaries, those types set very clear boundaries around the money so that's a great place to look when considering what your time boundary is.
It is also possible that you just don’t understand their competency or value. It isn’t a given that high skill in rational discourse is necessary for everyone.
I know someone in a similar situation. My advice at the time: get a big white board and a keep running score on who was right on any particular decision. I don't think they took me up on that suggestion.