[safeignorance]

That doesn't necessarily mean they aren't going to solicit ideas -- either from public calls or (especially) from recognized experts.

Most grant-giving organizations don't accept unsolicited requests for money, but then regularly put out completely public solicitations for proposals on specific topics.

From the article, it sounds like 1) they already have a lot of pretty specific ideas about where to invest; and 2) they're waiting until they coalesce matching funding from other foundations to start making solicitations/rewarding grants/investing in companies.