I don't think you understand. Basically you can create your own label but the battery will be Warner Music Group while your label are the plugs.
Example, you just released your debut album under your own label "Wrong As Shit". Under Apple Music, it will say "©️2020 Wrong As Shit/Warner Music Group".
People do this so they can own there own mess like masters but the big label (WMG) just helps with promoting the record. She was better off making her own label instead of signing with 300. That's how she played herself.