how is this a dark pattern? say that you bought a subscription of new york times for a year and put it on monthly installment. can you bail out of paying the credit card company after six months? only here, both the product and credit card company is adobe. in fact adobe is being generous by letting you "cough up" only a half the fee where your credit card company wouldn't. at this rate all credit companies are "dark pattern peddlers" according to you? adobe is pretty clear on the name of the subscription, "yearly subsciption, payed monthly" in big letters at the top of their pricing page.
The dark pattern is how it was presented. It wasn't "your total is X, split it in 12 monthly payments" it was a yearly contract disguised as a monthly contract.