It’s great what they did, very impressive and excellent product.<p>However, the article is a bit misleading, mainly for two reasons: “bootstrapped”, and “without spending a dime on marketing”.<p>They “bootstrapped” by financing the company with another profitable company. That technically means they were their own investors, but they weren’t limited only to the revenue that their email company was generating.<p>They didn’t spend “a dime on marketing”, but they did spend time promoting their product on several platforms, including producthunt, and they do have a blog (which is where the article is hosted), and they do have one full-time employee (out of four), in charge of marketing. So maybe what they truly meant is that they didn’t pay for advertising, but that’s different than not spending money on marketing, which they did, and in fact you could even say that it’s probably a significant part of their budget (given one of the only four team members is dedicated to marketing).