It also allows them to sell your data for mining purposes. In the next year we are going to see many AI business buy access to many unique large datasets.
"It's hard to imagine that we would ever consider collecting, let alone sharing, sensitive information with a non-agent third party, but if such a day should come, we will first give you the opportunity to explicitly consent (opt-in) to such disclosure or to any use of the information for a purpose other than the one for which it was originally collected or previously authorized." https://trello.com/privacy