The explanation for their popularity is that it isn't a constant struggle to use zoom for meetings. Their software may have other problems, but people can run it and get into a meeting with minimal effort.

Yesterday by comparison half the people on a Skype meeting had to dial into an audio bridge with their cell phones because their computer audio didn't work for no fucking reason, and screen sharing kept lagging unless restarted every so often.

The good marketing for zoom is that webex is awful.