Google should be celebrating the release of the Fitbit Air this month. The new screen-less fitness tracker gives competitors like Whoop and even aspects of the Apple Watch a run for their money with a number of unique features . Instead, Google is now dealing with backlash from some fo Fitbit's existing user base after the company retired the Fitbit app and replaced it with a new AI-focused Google Health app . On Reddit, not all Fitbit users are happy with the change, to say the least. "Thanks, Google, for ruining Fitbit," reads  one post,  which has received nearly 2,000 upvotes on the r/fitbit subreddit. "I’ve been using Fitbit for over 10 years and I canceled my premium membership today. The Google Health [app] is awful. No one asked for this. Google owes us all a refund on these watches." Are you an Apple superfan? Enter Mashable’s Big Guessing Game to win prizes.…