All the projects you listed get regular brief cases full of money, one just needs to have a look at their sponsor listings, which come down to the selected few I was mentioning.

Even the Linux kernel would never had taken off beyond an hobby project had not been for contributions from Oracle, Compaq, IBM, Intel engineers during the early days.

So yeah will Servo find such a benefactor, very difficult to say, but Samsung used to contribute, if I remember correctly.