It's completely open source. You can just clone the repo and build it yourself, if your org doesn't trust the GitHub CI (which builds the binaries and creates releases).

I wonder what these orgs do when they're buying licenses for Teamviewer or something?! This is fully closed source then and you never know what these clients really do!

Doesn't matter, unfortunately. Third party audited compliance certifications are the key to get in. Companies like Teamviewer are behind a gate forged in gold. Get funded, get certified, get customers.

If the last sentence was meant for me: I don't care, if companies want to use this or not. I don't need/want funding. I don't need or want to get certified and I don't want customers (I'm pretty happy to have a lot of users). It was built to solve a problem I had. It solved it. According to the GH stars and downloads and Feedback in Discord, a lot of other people liked it as well.