They have to install software by default.

Meet and Whereby, on the other hand, require nothing but a modern browser.

I will whole heartedly disagree. I set up a Meets for my whole family, no one had any issues connecting (and they used an array of devices from phones to laptops) just using the link in the calendar invite. I've used Blue jeans across several companies, not a single issue using just links.

Zoom has the worst UX of any of them. Here's what it looks like when I join a Zoom meeting:

Paste URL into browser (URL has company subdomain). Get redirected to a generic login page that asks how I want to log in, as if they have no way of knowing that my company has SSO enabled. Click SSO, get redirected to a new page asking me for my company's subdomain despite the fact that they already have it from the original URL. Get redirected to my company's SSO login and login. Redirected back, where they ask for my name, every time, even though it's on my profile. Finally, type in the meeting password and join.

It's literally awful. I can't think of a worse way to implement that flow. And I'm not installing their desktop app. Given their horrendous security track record, the fact that they shouldn't need a thick app to begin with, and that it has to run on my desktop because corporate VDI has terrible performance in video calls.