the screenshot does not look like nautilus, maybe xfce?

CSAM Spam. That’s what happened. Most people thankfully only noticed the moderator posts, but those understandably don’t want to have to filter that all day long.

Macs are not really what I think of when reading “middle of the road linux”

The type annotations are just fancy comments. They do not do anything at runtime. If you have a function that takes an int someone can still pass in a list or anything else.

Firefox Mobile also has this

I was talking about the history on device, of course I agree: never expect privacy on a device controlled by someone else.

I can confirm there are places where that is possible.

Also as long as they do not whitelist executables, you could use a portable version of a browser.

It does have it. But you have to invoke it with ADB.

well probably except on iOS, there you have to use Safari