In my experience, Zoom is the standard when you are dealing with the public at large. Teams/Hangouts/WebEx, etc are the go to options when dealing with an internal organization where all of the users are "known" ahead of time.

As a result, a lot of companies bought licenses because Zoom was the cool tech at the time. My company did this, despite there being an official mandate that all official communication/calls must go through Teams the year prior†.

I think the persistence of Zoom is just whatever the tech equivalent of a hangover is. Everyone binged on Zoom in 2020, and now that we're far more comfortable with work from home and have more stable setups, a lot of places are stuck with Zoom licenses. Embarrassingly, our company's periodic all-hand-calls still are on Zoom when every other operation is done on Teams. I think our brand team also decided to host a few presentations on Zoom when we presented in the US for the sole reason of "well, it's cool."

† I have no love for Teams to be clear, it's awful software. I do understand IT's mandate though, since the entire point of the mandate was to get people to stop installing random stuff on their work computers, which turned out to be a great idea when it comes to Zoom.

Zoom has the absolutely BALLS to sell a product called "ZoomGov" they say is more secure or whatever, but who wants to bet it's the same code running on different servers? They're also claiming HIPAA compliance, which I'm also certain is a complete lie.

They don't care. They'll say literally anything, and pay whatever fines happen if they get caught.

I think last year someone from the accounting department suggested cancelling Zoom because we had meetings already included in Teams.

It caused quite a commotion from the Zoom users a few minutes after we learnt about it. The plan was promptly cancelled.