The Nostr experiment will teach us that:

1. Entrepreneurship is HARD. Beware survivorship bias. 
2. VC money doesn't guarantee success. It just means you have more to burn through. 
3. You have to cultivate a brand to rally support
4. You HAVE to charge. Free only amounts to more free. Paying = signal. That's not to say that you can't have some free, but someone has to pay and signal for desired features. 
5. You HAVE to do marketing. Build it and they will come is a fallacy. Only works on rare occasions when you build something truly spectacular. Ideal marketing split is AT MINIMUM 50/50 build/hustle to get the word out. 
6. People lie. They say one thing but do another. Back to payment = signal. 
7. What developer values ≠ what users value
8. Building something truly unique can work against you because new concepts are harder to explain. Familiar = less selling required. 

Did I miss anything?