However I've used Zoom once or twice, for interviews or in one case working with a friend on a pair programming session.
At my company we use teams, slack, skype and discord (yes, really).
Heres the thing though; The first time I used Zoom I was actually petrified (as I usually am) that I have to install /another/ application and figure out compatibility issues, especially because I'm one of those crusty die hard linux users. I panicked so bad that I resorted to using my phone.
(Tip: don't attend interviews with your phone recording from your hand, it looks super unprofessional I'm told)
The second time I had a zoom meeting I just clicked the URL in the meeting request and it worked!
You have to understand, I'm coming from a place where things almost never work. Exchange? nah, maybe 2007, or was it 2003, who knows. Teams? Their linux port not only consumes all available CPU on my laptop (which is not a slouchy laptop) but it doesn't even function correctly with basic stuff. Slack works a treat (as long as I don't do screen sharing) and I suspect that this is largely why it caught on too.
My point is simple here: Proper convenience is hard to get right. On-boarding is a enormous part of why Slack is trouncing other instant messaging efforts (IRC especially).
The security is lackluster but very honestly (and with a heavy heart) I have to say that the majority of people don't care until it affects them.
We don't know how Zoom will respond, but for what it's worth, I like that their product works well on my platform, they deserve massive props for that.