[bogomipz]

No it's not their freedom to be on Spotify. That's not how the music business works. The record labels own the master recordings. Spotify negotiates rights to stream the records labels catalog with the labels. The artists have no say. The exception to this are artists who have negotiated to retain ownership of their master(very rare) or they have acquired their masters back through a contractual clause called a reversion(also rare.) Taylor Swift, Prince and Metalica are examples of people who own their master recording and can dictate whether streaming services can license their catalogs and at what cost.