I'll state from the start: no criticism of the OP here. Its a fair question asked out of interest but my reaction is: Hmm, all it needs is a suitable website / app. Register, for a small fee, and work for free for a privately owned business that probably won't charge you much for accommodation and food. Or you could undertake a charity expedition for a donation that might cover 1% of the chief-execs salary. Or you could just hang-back for half an hour in the morning and help the volunteer hospitaler@ in the donativo unblock the toilets and mop the floors.
I can appreciate that people can walk a bit of camino and fall in love with the life-style or just want to spend more time in camino but there are plenty of places on, and off, camino that could really do with enthusiastic and committed support that aren't looking for a bottom line somewhere above break-even.