In Liberal Radicalism: A Flexible Design For Philanthropic Matching Funds, Vitalik Buterin, Zoë Hitzig and E. Glen Weyl propose a mechanism for (near) optimal provision of public goods.

The paper is quite recent (December 2018). Considering that the EA community may be vetting-constrained, has anyone implemented or considered implementing the suggested mechanism?

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MIRI took part in a Liberal Radicalism-based fundraiser at the end of 2018 (see "WeTrust Spring" in this post).

The main issue with the mechanism seems to be collusion between donors. As Aaron mentioned, MIRI took part in such a fundraiser. I claim that it was so successful for them precisely because MIRI supporters were able to coordinate well relative to the supporters of the other charities -- there were a bunch of posts about how supporting this fundraiser was effectively a 50x donation multiplier or something like that.

Are you saying that this was an example of collusion?

-4rohinmshah3yYes.
2yhoiseth3yI'm not sure if I see how this is collusion. Would you mind elaborating?
3Ben Pace3yMIRI helped us know how much to donate and how much of a multiplier it would be, and updated this recommendation as other donors made their moves. I added something like $80 at one point because a MIRI person told me it would have a really cool multiplier, but not if I donated a lot more or a lot less.
3yhoiseth3yThis does not sound like collusion, at least according to the Merriam-Webster definition [https://www.merriam-webster.com/dictionary/collusion]: To me, it seems more like promotion.
9rohinmshah3ySorry, I meant "collusion" in the sense that it is used in the game theory literature, where it's basically equivalent to "coordination in a way not modeled by the game theory", and doesn't carry the illegal/deceitful connotation it does in English. See e.g. here [http://www.overcomingbias.com/2015/01/collusion-in-quadratic-voting.html], which is explicitly talking about this problem for Glen Weyl's proposal. The overall point is, if donors can coordinate, as they obviously can in the real world, then the optimal provisioning of goods theorem no longer holds. The example with MIRI showcased this effect. I'm not saying that anyone did anything wrong in that example.
1yhoiseth3yI don't find this to be obvious. In my understanding, coordination/collusion can be limited by keeping donations anonymous. (See the first two paragraphs on page 16 in the paper for an example.)
1rohinmshah3yIt's not hard for an individual to prove that they donated by other means, e.g. screenshots and bank statements. Right after that, the authors say: With donations it is particularly easy to harmonize interests: if I'm planning to allocate 2 votes to MIRI and you're planning to allocate 2 votes to AMF, we can instead have each of us allocate 1 vote each to MIRI and AMF and we both benefit. Yes, we have to build trust that neither of us would defect by actually putting both of our votes to our preferred charity; but this seems doable in practice: even in the hardest case of vote trading (where there are laws attempting to enforce anonymity and inability to prove your vote) there seems to have been some success.
8Ben Pace3yAh yes, agree. I meant coordination, not collusion. Promotion also seems fine.

I haven't heard of anyone implementing something like this. I think it's a great idea – would love to see more exploration of it!

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IIRC, the mechanism has problems with collusion/dissembling. For example, one backer with $46 dollars and 4 backers with $1 each will get significantly better results by splitting their money into 5 contributions of $10 each. This seems like a problem that's actually moderately likely to arise in practice.

Yeah, this and fraud are potential problems. They're discussed in 5.2 Collusion and deterrence (pages 15 to 19).