I agree with @Dave999 that as long as Jolla is not seen as a threat, Apple will not bother to start any litigation against it. Also, the patent/legal system is more sane in Eureope than in USA, you cannot win here just by throwing enough money in like you can in the states.

However, if Jolla enters USA markets, the next day it will be lawbombed by the fruit company for entering their home turf. It will not matter it probably costs more than they gain from it, they will do it just because they are mean and want to harm others.