Taking Netflix as example - it has been going downhill steadily, they have a habit of canceling good shows after one or two seasons etc. It is no wonder users get annoyed when they have to pay more over time, and get less for their money. Increasing prices is never going to be popular even when it is justified, but users are more likely to tolerate if the price increase comes with better features or at minimum, no drop in features/quality.

Another egregious thing these subscriptions do is all kinds of dark patterns. Making it super easy to subscribe but super hard to cancel, not informing before charging (how hard can it be to send an email "upcoming charge next week"), showing ads in supposedly "ad-free" services etc. All this just add to the frustration which leads users to cancel.