I really wish the FTC would crack down on blocking access when you cancel regardless oh how long you have paid for. It seems really unfair to consumers.
I didn't realize streaming services did this. Which ones don't give you the rest of the month that you paid for? I cancelled Hulu recently (not through Apple at all) and they informed me of the date I had service through, and I was able to watch Hulu for the rest of that month.
WRC+ does this.
I'm OP, but I didn't mean to imply one wouldn't get the full month, but more to emphasize the ease of cancellation via Apple. It's a consistent UI, no shenanigans, couple of clicks, done. Is cancelling through the streaming service a pain in the ass? Maybe, maybe not; but I'm much less inclined to sign up at the risk of finding out the hard way.
I believe I've seen some that distinguish between cancelling and disabling renewal and let you do either. Cancelling stops the service immediately. Disabling renewal stops the service when the current term runs out.