Not that I'm aware of. I'm guessing it's for fraud reasons. But I'm pretty frustrated by the lack of messaging/explanation around this change.

If you're going to change this for the worse, at least communicate to us about why the change was needed.

Dunno, but I'll bet the internal reasoning is somewhere between "we need to drive adoption of Payments" and "we'll save an extra percent or two that otherwise goes to a 3rd party".