I do trust Open Whisper and their open source project as well. I also trust Meta to do everything possible to collect even the slightest bit of data possible. Plus as Whatsapp is completely proprietary we don’t know how the solution from Open Whisper was integrated. Why not open source it like Signal does?
If you want to continue to use Strawberry, you could stream your music with a subsonic server, Strawberry supports that.
For me it was the other way round: I was using Nextcloud music and searched for a music player on Linux that could stream my .flac-collection via subsonic. That is how I found Strawberry.