Interesting discussion and would like to voice my opinion as well.
For years I have been wondering on how Jolla could make money from SFOS. Earlier they tried to sell it to some larger phone makers or some governments/corporations. From what I could read on the topic, that doesn’t seem to be going rather well. Move to Automotive may work out, but we will have to wait and see. But again, automotive is moved into separate entity, as far as I understood.
In this context, @ichthyosaurus comment regarding numbers and how much could it offset the developer costs is a good one. We have to remember, that development of SFOS does take developer time and due to this investment of Jolla we can use Linux-based mobile OS. There is a good mix of core apps developed by Jolla and community-developed apps. While, as a part of a community, I have a day job to enjoy and support me, Jolla devs are working on SFOS. And, in principle, if we want to use SFOS we have to have some way to pay for these developers working on OS that we like. Unless, we manage to contribute through development/translation/testing to make the product into such a shape that Jolla can sell it somewhere and make SFOS eco-system stronger.
I have no idea how many users are we. I have some internal guess, but it is rather small. Which would mean rather small income from subscriptions. Looks like many are opposing it for one reason or another. I would support it for the reasons listed above in this case. Whether it would make any difference, that’s hard to say. Ideally, I would love to get to know more regarding the financial state and how Jolla plans to make sure that they are in profit. If it would involve open-sourcing closed OS bits that would be awesome. As in the end of the day, I would like to use open-sourced OS on my phone that would work well for me.