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.
If that is your intention, GPL would make more sense, as every improvement and development would be forced to be made available to those people, thus helping them further.
I doubt that your code helps anyone who needs/deserves to be helped, after beeing processed by big corpo.
You could think about your definition of freedom. For me: My freedom ends, where it restricts others people freedom - I shouldn’t be free to rob people and call it restriction if someone forbids this.