> The difference is in people's expectations of mobile vs. desktop apps. You'd never install untrusted software on your desktop

I knew many Linux desktop users who had installed the Slack client back in the days we used Slack at work. Myself I have installed Skype. Not that I find Skype particularly good, but sometimes I need to communicate with people who have no clue about software freedom.

So, yes the number of "untrusted apps" is significantly lower on a (Linux) desktop, but "you'd never install" is an incorrect characterization.