I think he's asking about the layer we built on top of the shim to copy objects in and out of it. It's open-sourceable, we can consider it.
If I were you, I wouldn't assume good intentions especially considering you are just a start up and in a race for marketshare.
If it were up to me, I would set a date a year or two in the future and then open source it then, but only AFTER you have a large enough lead against your competitors in the market.
There is no reason that I can see to open source the secret sauce of your entire product.
We're kinda of all in this together. Security shouldn't be a feature or a competitive advantage, it should be a standard practice that all developers follow and participate in.
Everyone benefits when software is more secure.