We charged money for a good or service
I know this one is controversial, but there are enormous benefits and you can immediately reinvest a whole bunch of it in your project sips daiquiri. Your customers will appreciate that you have a long-term plan that doesn't involve repackaging them as a product.
If Pinboard were not a paid service, we could not have stayed up on December 16, and I would have been forced to either seek outside funding or close signups. Instead, I was immediately able to hire contractors, add hardware, and put money in the bank against further development.