In my past non-profit we used WPEngine, that was about 10 years ago. Yes they were expensive but we didn't have people, nor did I (a backend python guy) want to mess with websites and be on the critical path. If I had been aware of, or known how this company was profiting from Open Source, I'd have taken my business elsewhere. Roughly 1K per year, base plan at the time, so, not a huge amount. We were broke, so there was no question of upgrades.