From 2019 disney is supposed to have its own streaming service just like Universal, Sony, etc. And actually I wanted to get me now such a netflix account but I'm not so sure now if it is still worth Marvel movies or others still come on netflix or not at all?
Can you cancel anytime?
If you no longer like the offer, then you quit. It's that simple.
As I said, "it should". Whether it really happens, you never know in rumors. Let's say the rumors are true. Then Netflix is quit in a jiffy.
A subscription will only run for one month. Cancellation stop on time or buy only a credit card. No money, no extension.
Until the Marvel movies appear on Netflix, you've already seen and / or bought them anyway. Because of movies, Netflix is not worthwhile either. You have to have something left over for series. Or movie taste far, far, far beyond blockbusters.