Privacy and blacklisted hierarchies

Hello dude!
First of all, I would like to thank you. You're a very talented developer and a source of inspiration for me.

I have a few doubts about this very promising project:
- Privacy: if we send our screenshots + hierarchy to your server, will they be stored somewhere or will they be deleted once we close the application?
- I noticed that some hierarchies are blacklisted. The screenshots are updated but the hierarchy is not. Why is this?

Have a nice day, D

Use the issue's two questions as the starting points: determine how submitted screenshots and hierarchies are handled by the server, and why blacklisted hierarchies are not updated. Done means both behaviors are answered clearly in the issue or documented for users.

Written by the indexing model from the issue text.