I’m starting to see not as many newer mobiles in the Lineage OS list as I used to. The US is a lost cause with companies not allowing their bootloader to be unlocked, but even the Chinese companies like OPPO, Vivo, OnePlus etc don’t seem to have their recent devices on the Lineage OS supported list. Am I imagining this, or is the Custom ROM market reducing to just Pixel phones?
It takes a lot of work to make a custom ROM and maintain it. Each one has a maintainer.
XDA is a great place to find Custom ROMs for many phones, including unofficial LineageOS ROMs that will/might become official after it’s stable.
For example, the OnePlus 11: