Zoom is, or was, collecting a list of running applications on machines. Keybase requires that you run it on multiple devices for security. It would be reasonable to expect that Zoom would love to embed such data harvesting in the Keybase client.
Do you have a reference for this? Were they confirmed to be sending the info to the server? I would note that it wouldn't be uncommon for a program like zoom to have the relevant api calls in it to allow the user share a specific app with the conference call.