I feel that this estimation is highly misleading. The submission and composition stage involves, in reality, a large degree of communication with authors, tied to an online version of their manuscript. So far we have found that simply hosting the manuscript in an online bucket is not sufficient to do this effectively, and so the software that is used to maintain state of the manuscript and it's artefacts has not been one that we could see at this point in time as being one that could effectively run in Lambda. In addition, if we are talking about marginal costs of production, that cost usually has to include the cost of operating these systems, and the act of communicating with the author. The vendor figures quoted, and compared against here, usually include the costs of the operator, as well as the hosting and the software, and in this way I feel that the underlying approach at comparison if flawed.