It's really not a cancel hell like say Comcraps or a gym membership. It's several pages of trickily-worded and misleadingly-styled buttons meant to make you mess up and not click the ones you need to click. From a real computer (ie no "mobile" myopia) you'll be done with it in under 5 minutes. I think you could even do it right now and still keep your benefits until your actual expiration, but I'm not exactly sure as I only ever do 1 month free trials or $2 "1 week" trials if I need something quick in the middle of a project.

(This is not to say that they totally don't deserve fines for violating users' trust with user-adversarial design in the first place, just to point out that these dark patterns are mostly mitigable annoyances that they make up for on volume)