This way is completely legal if a MixCloud marketing service is using natural methods to bring MixCloud Plays, Favorites, Reposts. It will make your track music more popular, more professional & more exciting.
Also, MixCloud does not forbid the users to buy MixCloud Plays, Favorites, Reposts, Followers. The truth is this way does not affect your MixCloud account. BuyViewsLikes never see any cases for warning or banned when buying MixCloud Combo packages.