"recordbox Cloud Unlimited powered by Dropbox" is the best example of the Pioneer name tax. There is no way you can look at the service provide and justify the cost.
$29.99/month unlimited storage for your music collection might make sense if your music collection is over 300,000 songs, and if that was the case, you really should be culling your collection.
I came up 300,000 songs, because my own collection is ~20,000 songs at ~400+GB and Dropbox's personal plan is $9.99/month for 2TB.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko