As I mentioned in the linked reply to that topic:
There are no plans to change this as being part of the Professional rekordbox plan effectively provides you with an account to access the Team Dropbox plan. Yes, it's administered by AlphaTheta, but no, we don't access your files.
You don't need "grounds" to cancel and request a refund, we're happy to provide that for you if you're concerned about this policy.
Information on cancelling and requesting a refund are on this website.