Obviously you have to pay to cancel a year’s commitment.
They give you a discount for your commitment to pay for a year and they make that pretty clear on their website when ordering. I can post screenshots of that but I really hope that won’t be needed, just check for yourself.
If you don’t want a year’s commitment you can just pay the higher price for a months commitment.
Pretty sure you have to pay half of what you promised to pay them had you kept paying for the whole year. I highly doubt that they legally have to even do that. I doubt that an ISP or utility company would let you cancel at all if you had a years commitment.
You have to pay if you want to stop a year’s commitment early. Iirc you have to pay half of what you promised you would pay them over the year. So if you changed your mind it’s cheaper to cancel than to continue paying for the months you have left.
If you sign a contract agreeing to their terms (and receive a discount in exchange) you have to follow them. The same goes for any other contract where you have a year’s commitment like for an ISP. It’s all pretty standard.
Is it annoying? Yeah obviously but they make it pretty damn clear when ordering that it’s a year’s commitment and that you receive a discount. Any reasonable individual should be able to figure out why you get a discount.