If you want to make the world better you have to focus on the correct things. One of those is that deceptively advertised, difficult to cancel subscriptions should not be allowed. Another is that monopoly/oligopoly leads to price hikes and should also not be allowed. But people remaining in voluntary transactions which don't make sense to your personal sense of frugality? Honestly not the right bone to pick.
In the European Union, you can cancel any subscription by email.
But I agree there's a matter of degree: If people get renewal warnings and can easily cancel ('Reply with the word 'Cancel''), that's different.
> which don't make sense to your personal sense of frugality?
Why attribute stuff to people who disagree with you, in order to dismiss them? Why is it important to dismiss them? Maybe just believe they have some reasons and try to learn what they are.