One thing ive noticed on the new site is that it shows you, your log in history
(dashboard\settings\log in history)

Ive had the same ip for the last week, and I suspect it wont change unless I reboot my router.
One for my laptop and one for my phone

So it is very easy for EI to see if you are using more than one account with the same ip.

Sky TV also restrict the number of devices you can use to log in. So EI could do the same.
Assuming 2 or 3 devices, phone, laptop and tablet. This will also aid them to stop people using more than 1 account.

So, they have the power, but will they use it?

Just a thought