EA discourages creativity, and I think that's valuable for the movement at this stage. The most visible aspect of EA is charity recommendation, which shares the downside risk of all of its recommended charities.
The other reason is opposition. It's likely that any story of the sort "EAs funded a project and bad things happened" would almost certainly be used against the movement as a whole. To that end I'd recommend that the large charity recommenders (Givewell) distance themselves symbolically from any sort of speculative charity efforts.