I disagree with this. Checking recent ip's tells a lot. If it's in the same city vs in different states/countries. It's impossible to travel extreme distances in a matter of minutes. It can definitely tell if you are sharing or playing in different places. Now the user could be using a VPN which defeats my arguement. I do not think account sharing is against ToS (could be wrong) as long as both/multiple parties agree to share it. Now multiple accounts on 1 server is against the rules, but this isn't the case.