They also are the rare example of a company that actually left russia (even more impressive because the company was largely russian) unlike western and eastern companies that published some press releases, but still continue to work and collaborate with russia. Even the "privacy first" Apple continues to remove any app the russian government asks and pays millions in fines.
I'm one... I was introduced to JB by someone else who paid out of their own pocket 18 years ago. I thought he was crazy... then a couple years later I tried it in earnest and it was ... life (well career) changing.
Because not all "developers" are developers in their day jobs. I'm personally a sysadmin most of the time, and I do my own R&D (mostly academic, but novel).
Some tools I like are not free, and I buy licenses by myself.
They are bootstrapped, doing $400M+ revenue, and selling to one of the hardest segments (developers who are notoriously frugal).