Nothing anti-trust about genuine un-rooted and un-modified devices having secure access to the play store.
It's when you lock out phones that come from Huawei/Oppo etc. because they are Chinese, that you might be able to make a point.
Metadata is pulled from your external metadata source.
So either no volunteer/bot provided data yet or you misonfigured something.
Jellyfin usually doesnt refresh metadata daily but only every 30 days or so if the configuration wasnt changed.
Regarding the streaming issue: Check if VLC or smth can play the file.
Go to a hearing aid shop. They usually also have something lile that for ear protection.
Else research the peak and mid volume db expected of the venue you typically visit and ahop hearing protection accordingly.
Unlocked bootloader ≠ Root access.