@liaizon @theruran @alcinnz @tigase XMPP servers are cheap and easy to set up. The core software has been around for decades. Several proprietary chat services started as XMPP, then defederated, most famously Facebook Messenger and Google Chat. That's probably where most of the initial funding came from.
@foolishowl @liaizon @theruran @tigase As far as I can tell, the XMPP project themselves do not have much more of an internet presence than what I'm managing on the side.
So I believe right now their funding is very meagre, relying on the sort of opensource contributions which have brought others so far!