Apple Music has been out for a year today. After the initial three-month free trial, I would think that most people would notice $10 missing from their bank accounts every month.
Or at a certain point 10 dollars is nothing and the time alone to figure out apples weird settings isn't even worth it. I still pay for a few things that I never use but just don't feel like figuring out how to cancel.
Mark, that's a legitimate question, but shouldn't you also ask how many Spotify customers forgot to turn off auto-renew? After all, they are also quickly acquiring customers.
In my opinion, a lot of users of streaming media services are neither enthusiastic customers nor entirely forgetful. Their opinions of the services they pay for aren't consistent from day to day, either.
Maybe 3. Who doesn't notice $10 a month on their card? People with little spare money would feel it, and people with lots of spare money usually get that way by paying attention to their finances.