Except thats incorrect. Spotify is a store, asking musicians to give them the rights to sell their songs as a package deal in exchange for a cut based on popularity. All music gets ads. There is no "low popularity ad free" section.
And now you, and spotify, are saying "yeah I know we agreed to pay you based on how many customers came in here for your stuff, but I think what you rightfully and legally earned is chump change, so I wont be giving it to you."
You are advocating scamming people because you, personally, think the money owed is a pittance. Thats an evil, black hearted mentality.