well still you can use the spotify premium accounts i guess xDThese alts are not allowed on the Skycade network as they are public alts which HAVE been hacked to gain access to the accounts joining the Network with these Accounts breaks the rules. (I know this for a fact)
the site is owned by @Sooma and according to what I know, these accounts are only given to 1 person and they dont give it to another person because their alt database is huge. So its your personal alt. You can't change anything about it which means its NFA (non full-access) and the alts are renewed every 3-4 days.