I think people just jumped on the 'Zoom bandwagon' and assumed it was great, because everyone kept saying how great it was.
Of all those Zoom had the best balance of stability/resource use/call joinability
I find meet a PITA to set up and invite random people
WebRTC browser chat is great for rooms >= 6 people and is my preferred choice
But zoom works pretty well from 1:1 up to 500:1 and is very easy to join
Don't get me wrong, I hate the Zoom client but when the target audience is everyone in your company, including your PC illiterate middle managers, then I can see how Zoom is quite good
I think I had to use a phone dial in in the end
AFAIK Zoom doesn’t use browser plugins but WebEx definitely does.