There are plans now in 2025 to work on this slowly. A few apps have recently been opened up. More are coming. So it is underway.
In 2015 Jolla were bought by Russian owners. They didn't understand open source or free software, they just wanted something for the Russian market.
In 2021 these ties were broken, but it took a long time since the Russian owners didn't respond in any way. It is only two years or there about that they are on their own feet again. They are still severely understaffed.
The OS was 'licensed' to a Russian distro as AuroraOS , not sold.Its still belongs the Finnish company.Note , that was their biggest install base and revenue source they cut themselves off from.