Playlists of my partner curators and other 100% free.

The curators are the only ones who decide if your titles will be accepted or not, I'm just sharing.
I do not control any of its services, playlists... all questions refer to the site or curators.
If a site or links does not work or becomes paid, tell me. I don't often check all the links

For this to be really beneficial for you, I suggest listening to the playlists before submitting, to find out if your titles correspond, if the playlist has a specific style. If you are added, like the playlists, follow the user account, like the titles of the playlist you like, follow the artists you like on Spotify and
also on their social networks, then share the playlists on your social networks.

All this is really beneficial for the alghorythmne
here are the spotify playlists and the way of contacts
Reliable email addresses for your submissions here concerning Spotify, Instagram...