One thing that bothered me about it is that they didn't just add this; they replaced the "Upvote your own post" button that was there. So if you are used to not clicking on this button, you might not noticed that the text has changed to something completely different.
That said, I think it's fair for them to offer the option for people to set them as a beneficiary easily, but I really wish it had been untoggled by default, so that no one gives away money by a mistake.