Or they need to use whatever a partner or customer is using. I don't use Zoom much (and it isn't one of our standard tools). But one organization I have standing meetings with and others I interact with now and then do use Zoom. It's often not about what mindless managers (or engineers) "want" to use.
This is an excellent point. I am a teacher and my students have school-issued iPads which they are not able to just add their own apps. Even I can't control what apps they have loaded, I have to go through the school's processes to get apps loaded. This rules out switching to a different platform for the day just because e.g. Zoom is not working today.
Most of them probably have their IT team's preferred enterprise vendor's teleconferencing system set up as the exclusive videoconferencing tool long before Zoom became flavour of the month...
A six year old student also isn't someone who's at risk of losing a business deal because they can't get their IT team to let them install one of the client's suggested alternative webconferencing systems to do the demo at a particular point in time.
Of the many potential problems six year olds accessing education primarily through webconferencing may face, I'm not sure inability to choose their own preferred videoconferencing service is high up the list, and I doubt Zoom servers have more outages than their home internet and wifi...
I think the discussion is "what happens when zoom goes down?" -- and the college professor said "use blackboard". A first grader with a locked down computer set up for zoom won't be able to install blackboard.
How many kids are missing how many minutes of education from their parents and teachers being unable to find any digital devices with the ability to access webconferencing services other than Zoom?
Periodically losing connectivity is an occupational hazard of doing things with webconferencing made worse if the people at each end aren't particularly computer literate. But I'm not sure Zoom lockin ranks high on the list of threats to kids' education right now.