I don't know when cheating people becomes halal. They plan to cheat you at the end of your subscription by saying that you have already agreed to the terms that says you have to give 28 days notice of cancelling your account. So before you create a payment plan with them, know that you WILL BE PAYING FOR AN EXTRA MONTH THAT YOU DIDN'T USE AFTER YOU DECIDE TO CANCEL YOUR ACCOUNT. This information will not be sent to you in any of the confirmation emails they send to you, either from when signing up, or when paying.
THHEREFORE, OF YOU PLAN TO USE THEIR PLATFORM FOR ONLY ONE MONTH, YOU HAVE TO CANCEL YOUR PAMENT PLAN IMMEDIATELY YOU CREATE IT. This seems to be an intentional plan to steal people's money. So be wise.