I think the Android ROM scene is starting to die out in general. Stuff not working outside official ROMs/on rooted devices has always been a problem, especially with DRM. People want the freedom to do what they want with their hardware and DRM people want people to do only what they allow with their hardware, the two parties will always be at odds.
Huge parts of the ROM scene were on Google Plus (yes, people actually used that) rather than on XDA and similar, which didn't help. Google also tends to hire people who do impressive modifications for Android ROMs like the person who wrote magisk, making the custom ROM scene shrink some more. I remember the ROM scene being so much more active before the corruption and death of Cyanogenmod!
Huge parts of the ROM scene were on Google Plus (yes, people actually used that) rather than on XDA and similar, which didn't help. Google also tends to hire people who do impressive modifications for Android ROMs like the person who wrote magisk, making the custom ROM scene shrink some more. I remember the ROM scene being so much more active before the corruption and death of Cyanogenmod!