I cancelled something the other day - got an email saying it was up for renewal in 90 days or thereabouts with a link to the subscription page and a set of options where "cancel" was afforded the same screen real estate as the continue options. Not entirely onerous, I think, two clicks?
But ok, you might want to cancel before you get the reminder email. Settings -> Your Name/Avatar -> Subscriptions -> Pick the app -> Big red "Cancel Subscription" button.
But ok, ok, you might not know that they're under your avatar which is fair, it's not entirely intuitive. Settings -> Search -> "sub" -> Subscriptions is the first result -> Pick the app -> Big red "Cancel Subscription" button.
But ok, ok, ok, you don't have your iOS device to hand. macOS Settings -> Apple ID -> Subscriptions: Manage... -> Edit the subscription (this is broken on the Big Sur beta, mind.)
If you don't have your iOS device(s) to hand, nor do you have a Mac handy, then I concede it's going to be a bit faff - https://support.apple.com/en-gb/HT211011
But ok, you might want to cancel before you get the reminder email. Settings -> Your Name/Avatar -> Subscriptions -> Pick the app -> Big red "Cancel Subscription" button.
But ok, ok, you might not know that they're under your avatar which is fair, it's not entirely intuitive. Settings -> Search -> "sub" -> Subscriptions is the first result -> Pick the app -> Big red "Cancel Subscription" button.
But ok, ok, ok, you don't have your iOS device to hand. macOS Settings -> Apple ID -> Subscriptions: Manage... -> Edit the subscription (this is broken on the Big Sur beta, mind.)
If you don't have your iOS device(s) to hand, nor do you have a Mac handy, then I concede it's going to be a bit faff - https://support.apple.com/en-gb/HT211011