"When you give us permission to access, we can access the following data, and read, compose, send and delete your emails. E-mail account information: Google user ID, nickname, user name, profile picture, user token, Open ID, phone number, e-mail address. Information related to e-mail account: e-mails, subject and header information, lists, other metadata related to e-mails."
The app requests permission to read, compose, send, and delete emails, plus access full email metadata, Google user IDs, phone numbers, and profile pictures โ extremely broad access for a 'cleanup' utility app.