See this notification, which has been accompanying emerge --sync on gentoo systems for some days:
This package is masked and could be removed soon!
The mask comment indicates that this package is scheduled for removal from our package repository.
Please review the mask information below for more details.
No real development since Q1 2020. Last release from 2016. Users should switch over to media-sound/strawberry which is an actively developed fork. Masked for removal in 30 days.
Some influx of Gentoo users may be expected soon
I made the move myself a few days ago, and so far I'm pleased with Strawberry, save for an issue that I've mentioned in the "Suggestions" subforum.