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Yes, this guy is truly an inspiration. If you're a one person business, you will find this tweet very useful: https://mobile.twitter.com/levelsio/status/93870716650815488... (aka stop running after shiny new things and just do it!)
I think that's right. But there's a limit to what kind of business you can create with a single php file in 2018, and typically those spaces are pretty competitive. Pieter's approach of what lead him to land on Nomadlist is I think where the value is - scratch your own itch, and do a lot of business experiments - don't spend more than a month or two on a business idea if it hasn't gained traction, move to the next on…
Really, his projects are interesting and all but "just ship it" is not enough, it has never been.