Yes, their infographic lists "Dronecode" whatever that is, alongside node.js
The other problem with trying to calculate the value of the Linux kernel specifically is that it counts the costs of all the drivers as well and you end up concluding that building a kernel is infeasibly expensive (reality check: there are quite a few of them out there, made by non-huge companies). If Linux was developed from scratch commercially you wouldn't attempt to develop drivers for every piece of hardware known to man all in the same source tree. You'd do what Microsoft do and define a driver API. Then the costs of hardware support are spread out across industry and no one entity ends up paying the entire cost.
The Linux kernel guys don't do that because they prefer being able to refactor/redesign any part of the kernel at whim, even at the huge cost of having all driver development be centralised. But that's not the only way to do it.