Few developers means that there is room for more. I have been asked to join them for fun but I have no fun in doing develop anymore (not at my age).
However, you are focusing on the problem (few money, few people). I am focusing on the solution: bringing SFOS to a further level for which the business is profitable and growing and therefore hiring more people will be not a problem. As long as the new people will be added as a part of a strategic and sustainable growth path.
Jolla is selling Ubuntu Touch as alternative for SailFish OS. Many Debian users complains that Ubuntu is too aggressive on the market but in the last reunion they decided to deliver with their installation ISO, the proprietary firmwares as well. Because the market can be hard to please¹ but it is easy to be rebounced by it and strive to survive in a niche.
POST SCRIPTUM
This without using the Anbox approch but another competitive alternative because copycats of another niche are not viable and if they are then the technology behind them is not characterising enough. In fact, as you can read, Anbox has been initially started-up by Canonical.
NOTES
¹ If I would asked my customers what kind of better coach they want, I will never made a single car - Henry Ford