If Facebook would be ads-free, free, and open-source, would you use it? I'd be scared as hell. Imagine this line:

> We are fortunate that our friends at GoodCorp fully fund the project. GoodCorp uses Facebook technology in products like GoodCorp Social. The open source community and meet.facebook.com service help to make Facebook better, which makes GoodCorp products better, which helps to further fund Facebook. This virtuous cycle has worked well in the past and should continue to for many years to come."

And keep in mind that Jitsi seems like a more resource-hungry product (real-time video).