Lineage has been the go-to ROM that beat every other ROM in active users by one or more orders of magnitude since the beginning of Android. Everyone that cares a little bit about custom ROMs knows what Lineage is, and if they don’t they will recognize its previous name CyanogenMod.
Average users are never going to care about custom ROMs because it’s not worth the effort for them, so why would you care about making LOS more mainstream?