Hi community!
Trello is awesome product, but we need to consider security.
If you have use the public boards publicly available on Internet you might be exposing more information than intended! See below 
Everyone knows the Google indexing so much info from web sites.
In fact, if you write the correct request you can get sensitive information from Trello user boards.
For example:
Also you can find for other domain and interesting phrases.
Conclusion:
- Please, review info on your boards.
- Change passwords any other credentials
- Don't put sensitive info on trello boards!
- And push Trello support to remove indexed page from Google cache, and other search platforms like Yandex, Yahoo.
- If you have the Premier support, let's raise issues about stop indexing and remove from Google cache.
Hope it helps!
I will be happy if you send to other users this info.
In my opinion, so much users from the it world parse info.
Also you can help to prevent use the sensitive data just suggest some static checker on Trello side like Sonar (popup window if find word password), also stop indexing ( I mean review robots.txt).
Thanks
Cheers,
Gonchik Tsymzhitov