Cloud serial is connecting to a VM in AWS/GCP/Azure via the built-in console connection. Mouse doesn't even necessarily work over rdp to an xrdp endpoint running a terminal in gnome (where you expect it to). Honestly except for true local applications, I don't remember the last time mouse worked.
I do agree on the teaching point, examples are everything.
If I can't show you what I'm talking about while I'm talking about it, I probably won't talk about it. Students don't learn by listening to me...they learn by putting hands on keyboard and breaking things.