"[...] But Zoom - one of the most used VC services - falsely claims that users need to install an app to use it. I've had frustrated colleagues express their displeasure that they can't install an app and, therefore, have to dial in on a phone and can't see any slides.

Here's the thing. Zoom supports web browsers. It just hides it really well. Only after attempting to download the app, and then waiting for a few seconds, do you get this tiny message saying you can join in the browser:"