there are too many people asking for improvements in spotify clients etc etc..
the best (easiest) way to solve this is of libspotify would be enabled for mor users,
seeping that free ad-supported spoify became availible on smartphones already, why is the same not true for spotify users on custom platform like linux bsd and loads of embeded devices. and even, implementing advertising is not possible for some obfucated reason,
than at least enable a subset of the features for the 5 euro (unlimited) plan, as a trade of solution. after all you dont really need most fhte ofline playing etc avance features on non smartphone devices anyway.
There is already a similar idea to yours here: https://community.spotify.com/t5/Spotify-Ideas/Make-the-client-partially-free-and-open-source-softwa...
Please add your kudos and comments there!