It depends on the licensing type of the original song.
If it's "remixable," you can choose Open License or Open License+ for commercial use. Therefore, you can distribute your remixes to DSP (Digital Service Provider) via OurSong if you subscribe to the OurSong Pro plan.
If it's "not remixable," you can choose Collectible License for non-commercial use. Therefore, you cannot distribute your remixes to DSP.
Choose what suits your music goals best!