No, I haven't succeeded because I haven't tried yet. However, I am surrounded by open source companies that succeeded.
The comment I responded to obviously reasons theoretically, and confuses some things. I will answer two aspects of it:
> Open Source makes "competing" with an existing company trivial, but with none of the invested costs. So the first mover, the program author, is always at a strategic disadvantage
That's not true. You can't just take some open source program developed by someone else and make money out of it. Let's say I develop open source product P. I offer support and consulting. Let's say you want to compete with me on P. You initially lack the expertise and the notoriety. If Alice and Bob want to get support or consulting for product P, they'd better turn to P experts, which is the company that builds P, me. For you to get customers, you need to prove the world that you are an expert. It takes spending time with the code, and also on marketing. But while you are spending time on this, I am too. You will also fatally need to contribute improvements to the product you are selling to make your customers happy. Actually, if you start contributing, it's a win for both of us and our companies can even be friends.
I'm not making this up. That's actually where I work.
> This is not an accident- it is baked into the very point of open source
So we just countered this. I'm not saying there's no risk. but that's not "by construction".
> There's a reason that very few people in the bazaar actually make decent money. There's a reason the cathedral has treasures.
And now we are confusing development methods, not "open source vs not open source". You don't need to be organized in "bazaar" to build free software. Look how, for instance, SQLite, as open as you could dream, manages very well with their non contribution policy. They are profitable. They have a "first mover advantage".
> These are two pretty distinct concepts, and the (traditional) motives for those two things don't merge terribly well.
Well, they can.
But my biggest argument is that you don't need to believe me. Many "actually open source" companies have succeeded. So, what gives?
I don't need to actually build an open source company to prove my point. Others have been doing well. Maybe me in the future, that's not completely excluded. Thing is, being employed also has advantages.