Who the fuck are they talking about? Clearly not HashiCorp. The most popular tool in HashiCorp's ecosystem that wasn't written by them was written by a consulting firm who hated HashiCorp's UX. Hashi is like Amazon: shitty UX, but features that capture a market early, and so they remain a dominant player despite shitty UX and unnecessary overcomplicated bullshit.
There are only two things that you need to succeed with open source. 1) solve a problem nobody else has solved yet and drive massive adoption. 2) make it so that eventually people realize they can't get any farther without paying for enterprise features, and their lock-in and over-confidence from the free product will make them convince their bosses to pay you.