Mark from SendBoard here.
We are always looking for new ways to further protect the privacy of our users. So please drop us an email at email@example.com if you have ideas for how we can improve.
I can't think of why you would not be able to remove SendBoard. All I can suggest is that you ensure that your first disable the Power-Up from the board menu in Trello, and then remove the SendBoard bot from the board.
I'm really sorry for the trouble. Feel free to reach out via email if you need further assistance.
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