And first of all, as the OP noted in the twitter thread, they believed they were doing a monthly subscription as advertised; the "yearly plan" interpretation is Adobe getting creative in the terms of service.
https://www.adobe.com/creativecloud/plans.html
... from my perspective, it is clearly written "annual plan". You can choose to pay on a monthly basis, or in a lump sum. There is no "monthly subscription" or similar.
Now it's possible that this page has changed since the OP subscribed, but I don't think it's changed that much - I remember this clearly from when I signed up which was many years ago.
The OP might be unhappy that their expectations were violated but I really don't think Adobe is trying to hide the nature of the product and its annual commitment cycle.
All Apps
US$52.99/mo
with a button that says buy now. It says its an annual plan billed monthly in the item description after you put in in the cart for one screen prior to you paying for it with the description in small print off to the side wherein most users will see the form they are supposed to fill out and the brightly colored button below "continue to payment"
They get more clicks by not listing it as n dollars a month in one page, putting the description in small print on the side in another page, and mentioning the fee vaguely faded 6 point font on a third page.
If they believed that they were signing up for a monthly, they did not read, what they were signing up for, its clearly stated on the sign up screen.