As the maintainer of several very popular open source projects in the infra-structure space, I was initially impressed by hearing the team had gotten 2M USD in revenue over three months, but then read they'd already brought in 2M USD in the previous two years, totalling 4M USD over ~2.5 years.

If I could figure out a value-stream like these two gents, then my OSS work would be on another level. This isn't your classic "Indie Hackers SaaS" or viral eBook stuff.

Hats off to you. I'll be the first to buy your eBook :-)