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
Want to add in a potential extra as well… even if you DO find a service good and worth continuing to use, It’s a good idea to try and cancel it anyway. Why, because a lot have special automations to attempt to retain you by offering you deals.
“are you sure you want to leave, what if we gave you 3 months at half off?”.