With free Spotify promotions, it tends to be harder to measure the success of the promotion, and there is less control over who gets access to the content. Paid promotions, on the other hand, can provide more detailed data and insights, allowing an artist or marketing team to optimize their strategy and improve their results. That said, free promotion can still be a useful tool for artists and labels to increase their visibility on the platform and attract new listeners. Many successful artists have used a combination of free and paid promotions to build their fanbase and increase streaming services.