So I have used Mullvad for about 3 years, same account on PC and mobile, I live in Thailand.
Recently, I was unable to connect to my banking apps, tried different setting, but nothing would work, so I cleanly deleted the app.
Left it a few days and re-installed from the app store, put in my account number, and a message popped up "too many devises connected" and there were 5 other different user accounts connected to my VPN, all of which I was able to delete
Looks like my account number had been hacked?