Unfortunately there’s this post too: blog.bananahackers.net/…/on-the-state-of-kaios-an…

Many “council” members have lost interest in developing for KaiOS. Many have not and believe this OS will live on and cover a minority of the market

But now, in 2023, this mobile Operating System seems to be on the verge of death. Not only KaiOS 3.0 is out but also KaiOS 3.1 is also out. But there is no device which is available worldwide. Only few carrier-locked devices for North America.