Well, I came to report this bug because I think this bug is very unfair and because I accidentally found out.
Explaining how I found the bug:
I was curious what it was like to play Town Of Salem on the web (I don't have a computer), so I went to Google and searched the site using the Chrome funcion: "Desktop version". I managed to enter the site and was in the login part, I pressed instead of entering the username and there was no cell phone keypad, so I downloaded a keyboard app that popped up the notification to press and show keyboard, well I put my password and username Aaaaand... Ta-da! I got it, I put my friend's referral code and I couldn't play it. As I couldn't, I went to play on the mobile (note: I don't have mobile premium) And I managed to play a lot of matches without watching an ad, I found it strange and now I'm reporting this bug!
Well, hope I helped, I love this game very much and I came to report this bug.