I have just discovered that BTT collects Usage Data. Not that I believe that, just to be sure, is this data associated with a user name and sent to someone in the background while using the app? Thanks.
no, the data is only available to you and doesn’t leave your system.
Good, thank you!
Although it would be very interesting for me to see what features people are using 
Maybe sometime in the future I’ll add an anonymized (opt-in) for sending some usage data to me.
Of course, I understand that. Such reports can also be good for the user. Because they can help you develop the app. The important thing is that you ask and the users agree, That would be guaranteed with opt-in 