Not sure why you're responding with that amount of hostility, I don't feel I did anything to warrant it?

Matrix's creation and development for the first 3 years was funded by Amdocs, as evidenced on the Matrix.org website itself:

How is Matrix[.]org funded? For the first three years of Matrix's development (2014-2017), most of the core contributors worked for Amdocs, who paid for them to work fulltime on Matrix. In July 2017, Amdocs considered the project to be sufficiently successful that it could now self-support and so stopped funding. The majority of the core team is now employed by Element, an independent company set up to hire the team and support Matrix's development. Other contributors are funded by their own employers or donate their own time to the project.

Amdocs is a telecom company that was founded in Israel, and later went on to run much of the US's telecom infrastructure. It has long been suspected to be involved in espionage for the Israeli government.

One of their revenue streams is providing their services to law enforcement, as they admit to here, which I'm not particularly comfortable with, personally.

So you’re confirming my point

When I say 10,000+, I mean it may not scale to encrypting that amount of people in a single room, not that the service itself cannot scale beyond that. Due to its distributed nature, it can avoid being bogged down by having many thousands of users, but if 10,000 people all tried to go into a single encrypted room where all those messages would have to be sent all at once, it would, I assume, bog down. That's an insanely unlikely situation to ever occur, as any public server that could grow to that size would not have encryption turned on anyway (and Discord itself, the thing we're trying to replace, doesn't have any encryption at all).