Remember there's another entity involved here: Sony.

Sony might be considering this some kind of marketing exercise, much like their Open Devices program anyway since its only of tangential benefit to the mobile division of the company.

So with a marketing budget the size of Sony Mobiles, how many Dalvik licences are we talking about here? 2000? 5000? It's not inconceivable that Sony would just give them away for free, since you must have already bought a Sony device to use it anyway.

But this is just speculation, since not even Jolla themselves seems to know how exactly its all going to work.