I think the issue is interoperability. I have some kind of account with all three you mentioned. But not everyone does. We have an Exchange server where I work but I don’t know if it includes teams. But with Zoom it doesn’t matter if the other people have an account. For instance I have meetings with everyone in my group every two weeks in which someone makes a presentation. As the host I can enable them to be able to share their screen and they can make a PowerPoint presentation to everyone. Next week I have a meeting with someone in Scotland and we just sent her a link and she can join and make a presentation. I use a Mac but I’m pretty sure she uses a PC but it won’t matter.