An incentive for the users to also drop Microsoft products, starting with Visio?

I’m not convinced Zoom doesn’t just sell your contact information to third parties.

Sounds like you are asking for an iPad or a locked down Android pad. The commercial pad offerings to the non-technical public are GUI only, they spend a huge amount of man hours to create the UX. Even if the Linux desktops are getting better every year, you are accepting a limited experience without the terminal.