You have a Collection, which is where music you've purchased resides. If an artist decides to remove their track, but you purchased it, it's "soft-deleted" - the artist themselves cannot access the track, but you still can.

At the moment, the upload limit is 15 tracks a month. Since this is a subscription-less service, there's no way to subscribe to a plan for unlimited uploading. We can always override the limit on a per user basis, depending on your needs.