Not the same though. A lot of people are just too lazy to cancel. If Disney had to terminate all the subscriptions that would probably have prevented this type of behavior
You'd have to elect to resubscribe with the new terms. Bonus points if it has to be the normal subscription flow, not some kind of one click to resubscribe.
I'd bet the pressure of instant drop in revenue and the likelihood of people being less motivated to resubscribe would kill some of this behavior.