Because the porn site says "free for 3 days" and of course nobody remembers to actually cancel the subscription after 3 days. When they get the bill a month lat

Because the porn site says "free for 3 days" and of course nobody remembers to actually cancel the subscription after 3 days. When they get the bill a month later they say "I never bought a full subscription!" and they cancel. It's a cat and mouse game. If customers KNEW they couldn't keep getting charged they'd gladly pay $1 to watch for one day. $1 is STILL going to have $0.05 fee, not $0.35 or whatever the CC processor would charge for such a small transaction.