Amazon Prime is particularly heinous about using dark patterns to confound users into risking forgetting but ultimately you’ve already paid for the month, year
I can confirm this to also be the case with most streaming giants plus the less-giant Shutter
Edit: comments have pointed out some notable exceptions such as services through Apple and HP Instant Ink
Not all. Some end your access as soon as you cancel, normally they let this be known while cancelling, but not all of them do that.
If they don’t prorate a refund then they’re stealing from you. Obviously if this is a trial they can cancel immediately if you haven’t paid but otherwise it’s theft.
I agree, but good luck getting anywhere with it if they choose to not refund you.
That’s what charge backs are for.
