I wanted to take a look at a GNOME look in Peppermint by installing Skype by snap.
Then I got this message in the terminal:
perknh@peppermint ~ $ snap install skype
error: This revision of snap "skype" was published using classic confinement and thus
may perform arbitrary system changes outside of the security sandbox that
snaps are usually confined to, which may put your system at risk.
If you understand and want to proceed repeat the command including --classic.
Hmm...

This conflicts with:
Not only are snaps kept separate, their data is kept separate too. Snaps communicate with each other only in ways that you approve.
Source:
https://snapcraft.io/To remain on the safe side of things, I've decided not to proceed.
