Word Hive (by Jon Welch, G7JJF) only stores data on its server if you joined the optional leaderboard. Deleting it removes your nickname, all your leaderboard scores, your hive chat messages, your hive memberships and any hives you own. Your puzzles and progress on your phone aren't affected.
If you've uninstalled Word Hive or lost your phone, contact us via g7jjf.com with the subject "Word Hive data deletion", and give your Word Hive nickname and the name of any hive you were in. Your data will be deleted within 30 days and you'll get a reply to confirm.
See the privacy policy for what data Word Hive keeps.