How to prevent someone adding me to a board without my permission? There is no 'report abuse' link in the email which informs me someone has added me to a group without my permission.
There are only links to more spam, and trello preferences. It is a genuine email from Trello, the spam link is what Trello provides (eg 6 ways to get more out of Trello etc etc etc)
Why does Trello allow this?