I have a degree in computer engineering and have founded a struggling startup. My one year doing my failed startup was immensely more valuable to me than my 4 years at university. But that's just one anecdote.
In your own startup, it feels like every stroke counts, and you are doing something you find exciting and meaningful. It's likely not that startups offer more teaching experience, it's just that you're bound to get more out of something you really dive into.
Having said that, most (all?) college curricula do not cater for people intending to do startups, but they still have a lot to offer.
Certainly not everyone's like that. Certainly college is a really useful tool for many people. Its also an good tool to climb the social ladder. But the assumption that its right for everyone in a certain social class... that's whats fucked up.