drop servicing shouldn't be a name... it's only a term that was created to ride on the trend of dropshipping and sell courses to newbies...
Outsourcing is as old as the internet. We can also call it service arbitrage or service reselling, but I refuse to aknowledge this as a kind of new business model, because it's older than my grandmother
To reply to your question... reselling can give good results or bad depending on how you market it