Common UI has "yes" and "no" (or whatever terms) next to each other, often in different colors. This is mimicing it so you think it's two separate buttons when it's one button for "yes".

And has "cancel ..." like you'd expect on a cancel button. If you stop reading or are skimming (we all do it) you think it's the cancel button. This is very likely a deliberate choice.

Different color, common placement, the word "cancel ...", you go on autopilot, and now you're subscribed! And good luck trying to cancel.