I had an unlimited music subscription but got stung after signing up for a trial of the family subscription, couldn't use it and got signed up for a family subscription and charged - no trial. Cancelled everything and 11 months later sign up for a new trial of music unlimited because of all the changes to the free music streaming. Get subscribed immediate and charged for a months subscription without my permission.
Avoid Amazon subscription trials as they take money without permission. Unethical business practice!