Re: Why zoom?
Since lock-down, I've used (for work and leisure) FB messenger, Google meet, MS teams, Skype and Zoom. Zoom for me is head and shoulders above the rest: simpler to set up, better audio and video quality, and more reliable (of course your experience may be different)..
I think it's telling that this is from a start-up who focus on doing one thing and doing it well, as opposed the the offerings of various mega-corps who see something new and want to add a slice of the action to their portfolio.
I guess it's only a matter of before Zoom get bought by someone much larger, and I'll have to start looking for an alternative.