Thanks for the interesting rabbithole.

Well, that's something I didn't know, but it seems like they've been in the process of removing or giving the ability to remove the parts that communicate back to the main Matrix coordinators since 2019. And it's been 2017 since they had funding from Amdocs. I'd certainly listen if someone says they've recently analyzed that sort of data going back to the organizations servers. It doesn't look like it though.

At this point, the fact that it's all opensource and the self-hosting options/configurations let you keep things internal now would make the point of its origin moot. TOR is another example of something that may have suspicious origins but because it's public and OS, most people trust the privacy of its implementation.