The combination of limited file availability (reducing the ability to report bad actors), as well as Firefox urls being inherently trusted within orgs (bypassing a lot of basic email/file filtering/scanning), was the reason it became so popular for criminals to use. Like we've seen in the spearfishing attacks in India[1].
[1]: https://www.amnesty.org/en/latest/research/2020/06/india-hum...
The fact you can download it with this tool is because the artist is letting you listen to it for free before buying it. Downloading it with this tool seems totally unnecessary and a bit of a jerk move. Bandcamp hosts mostly small and independent artists and labels.