Why would I spend $700+ on a phone with a dubious fate when I can spend $230 on a Moto G5 Plus and have Lineage OS running on it in no time, for a long time?
LineageOS is the continuation of CyanogenMod after Cyanogen Inc decided to close their Seattle office and pivot away from Android. The best way I can put it is "easily buildable Android for unlocked devices" (that is, assuming your device is supported - if it isn't, it's a bit more work). There are a handful of modifications but overall it's close to stock.
> Devices shouldn’t become outdated every year. They should evolve with you.
Also the design looks much nicer than average cheap Android phones.
They only promised 3 years of security updates.
Make me a $200 phone with 3 years of updates and I'll be impressed, or an Android flagship with 5 years.