I tried it: I don't want it. After lots of frustration, I tried following official cancellation instructions for adobe stock. Still not possible. The option just isn't there to cancel. This is just really convenient for Adobe. You can spend your photo credits with a single click, but if you don't want to get stuck in a ridiculous annual contract, it's an hour or more of frustration resulting in failure.
I'm spending my 8 remaining photo credits on random stuff, just because I'm so annoyed at Adobe; it's all I can do to make them pay...
Please cancel my trial, or fix your website so I can do it myself. (PS: the status monitor says account management is fine.)
Yeah, I tried contacting support through both Twitter and the forums, since
I wasn't really expecting any response. Someone else took care of it