I wouldn't want a visitor to be reading my emails to santa, or seeing the pictures from Alpha Gamma 5 that my "friends" sent me.
Imagine the blackmail potential in that eh.

A lot of people put stickers on their laptops to personalize them. Maybe the MS one is for personal use and the Apple one is for business use?

I don't understand the disgust part in it.
It's their property they can do whatever they wish.

I have a Harbor Freight sticker on mine...

Does the sticker prevent you from opening the computers?

I'd say that it's more a sign of paranoia on your part.

Their stuff, their decision on what they do with it.

So only the 2 older cousins are married?

Are you unable to use either of the laptops? It's not clear.

You're thinking too much about this .

On hÌll come back to you that

Were you hoping to use their laptops?

It's a sign that they like putting stickers on their laptops

someone's paranoid

They sound like they want to hip and young again.