WhatsApp isn't a conference tool. You can't have more than a handful of people on a call. And it's with people in your contacts on your mobile phone.

I presume the same with telegram.

Skype for business has been deprecated by Microsoft in favour of teams. I use it daily and it's just not that great. It requires a Microsoft subscription.

Google hangouts meet only just became available for everyone to use. Before it required a Google business subscription. It makes my CPU usage max out and cooks my laptop.

Zoom works well with 10s of people in a call, it's easy to use. Breakout rooms is a useful feature.

With COVID so many people are using it not because of a marketing campaign but because it's easy to use.

I think it's like asking "why is a an iPhone better than a Blackberry? They both make calls and send email."

But I think Zoom has built their product to not be "enterprise" which in my opinion is a good thing. As that usually means you need to accept jank.

Of course there are security issues with the software as well.

But aren’t there other conference tools like uberconference and jitsi? What makes them worse?

I don't know what you want me to say.

I haven't used jitsi or uberconference. If you have, tell me why they aren't popular?

Do they do anything that Zoom doesn't?