If you think about it, Phil lives less than 100 miles from the Canadian border.
Anyone can sign up for a porn account using Phil's email. That doesn't mean he actually uses the account.
The difference in his Brazzers account was it was discovered in his emailed credit card statement or something. Detractors found out his bills and one of them was the Brazzers membership.
Phil would have had to known about it since he was willingly paying it each month.
"Maybe Phil doesn't go over all his charges on the statement" fair enough. But this would contradict his rant about how Macy's overcharged his card that one time and he found out. He has to go over all the charges to make sure trolls or cyber terrorists aren't using his card.
In conclusion, Phil's email being linked to these porn sites isn't proof that he pays for porn. The proof was that he was recieving bills from Brazzers and was paying them.