Thanks for the proposal 
As @armog says above, the reliance of Gnosis Chain on Ethereum’s technology and development does provide some good justification to support this proposal. Though the Ethereum Foundation is well funded, a joint funding arrangement as envisaged here seems fair. The $100k request is also relatively reasonable in the scheme of the DAO’s treasury.
With that said, we would prefer to see a more conscientious approach to supporting Ethereum, as opposed to simply approving any ad hoc proposals as they arise. Allocating a set budget for the year, putting out a request for proposals (such as this one), and allowing the DAO members to vote on the allocation of that budget among qualifying proposals would be a much more satisfying means of reaching the same ends. To the extent an arrangement like this is within your remit @snapcrackle, we would be interested to explore further beyond this proposal.
Given the Attackathon is fast approaching, we are leaning towards supporting this proposal on a one-off basis.