There’s a stigma in the underground scene that it’s not acceptable to pay for repost and promotion, but artists have been paying for promotion for years. That’s what labels do when they sign their artist. They pay and promote they’re artist. If you’re not signed and don’t have many connections you should rethink turning your back on buying promotion.
Reposts are also very useful because it helps build an organic audience that will still stream and share your music. In no way shape or form should anyone buy fake followers, plays, views etc. Just think twice if you’re an artist with very little connections trying to be heard.