Why use closed source software zoom to meet?

[desputin]

Hi, sorry to bother the community with open source talk, but why does an open source project use zoom in order to meet online?

https://thunderbird.topicbox.com/groups/e2ee/Ta4e5f3b62b12851e-M35162a57207b8e0c1c83faf2/community-o...

There are great ways of meeting via open source platforms such as BigBlueButton.

I don't understand this...