I’m fearing about this also. But opening sources means additional work (change the licenses, check the dependencies, do the repository uploads…) while giving no immediate financial gain. I would have supposed that in case of debts and bakruptcy, you try to sell your belongings to reimburse creditors. So I’m a bit hopeful, that it means a new owner with a policy that is more Open Source friendly. Future will tell. With a bit of luck, we’re not replaying the Symbian twilight when it was open sourced before its termination.
In the meantime, another repository appears: sailfish-svg2png which is used to generate images at different resolutions from SVG files.
Which provides another possibility: transferring maintainance burden to the community to various proprietary pieces so the remaining is smaller and means a lower cost. Not sure this is actually the case since Jolla stays the upstream, which means that they will have to handle community PRs…