Charity program will no longer be cancelled, according to Manifold Twitter.
This sucks. See the Slate Star Codex post(s) (which I sadly cannot now find) about how payment processors end up being enforcers of the law instead of the government. And it's not a good situation, since they:
[Edit: FWIW, I think Stripe/Visa/Banks are fundamentally subject to incentives created by regulators to do this, and would probably be shut down if they did not.]
This is a bummer to hear... part of why I felt comfortable buying mana, even when I lost it, was that I figured a lot of it would end up with effective charities at some point.
In retrospect, this was probably a simplistic view of the site, but alas. I do hope their team is successful in finding another solution.