We send listeners to a Smart Link first for a few key reasons:
1. Sending potential fans directly to Spotify greatly increases the chances of the Facebook algorithm optimizing around bots and click farm accounts instead of real fans
2. When a potential fan hits your website, you can track them with other tracking pixels (ie: Google ads, YouTube ads, Spotify ads, Snapchat etc) so that you can expand your advertising efforts beyond Facebook in the future
3. Sending potential fans to your website first increases the steps the fan has to take, but also increases the quality of that fan because they have taken more commitments to you