[^1]: Their words, not mine! [^2]: Not in any rigorous/bureaucratic sense, just in the sense of "finding people who are willing to work closely with you to provide feedback on how you're solving their problem"
For those who don't know, Justin runs https://buttondown.email
It's an incredible newsletter service that's been growing in popularity, because well, he built a delightful product :)
Well, that's if you base it on "passion" and "scatching a personal itch" and such. If you just want to make money, it's enough (and often better) to merely want to start a business, any business. Then you check the market conditions, find a good niche, and execute.
People with succesful businesses making whatever didn't necessarily want to be in the "making X" business. They wanted to be in the "making money" or "making sales" business. Some of the most succesful businesses the onwers could not care less what they sell, as long as it sells.
This clicked after I've read several such stories (e.g. from a guy who had a factory and was just a generic product manufacturer that builds "whitelabel" stuff for others. He could not care less about generic manufacturing as a "passion", it was just a job he could do well, and saw he could make profit and eventually sell, as he did for tens of millions), and also met some such people in different businesses.
I'm pretty sure most tech startup founders don't care about some specific business idea "passion" either. They appear to do, but if they did, they'd insist to their original "passion"/idea and wont pivot to something completely different all the time, just because it's more profitable.
Twitter started as Odeo and was about podcasts of all things. Groupon was about consumer activism. Instagram started as a service for "checking in" particular locations. Slack came from a game development company making a game.
The problem is not "merely wanting to start a business and not knowing what kind". The problem is "merely wanting to start a business and not acting on that".