But I went to the ABCD Study web site, and read the article they link about ethical use of data (Responsible use of population neuroscience data: Towards standards of accountability and integrity).
I didn't get the impression that consent (for this study or future ones) is the reason they gatekeep the data.
It doesn't really matter whether we agree with the principles in their ethics guide, because they form part of the commitment made with human subjects who participated. If the guidelines said that every scientist handling the data had to do so while wearing a rubber clown nose, that too would bind!
But I went to the ABCD Study web site, and read the article they link about ethical use of data (Responsible use of population neuroscience data: Towards standards of accountability and integrity).
I didn't get the impression that consent (for this study or future ones) is the reason they gatekeep the data.