For the journalists in this forum: This may or may not apply to your experiences. Was there an instance in which you've cultivated an off-record, anonymous, deep background type sources who at some point in the process decided against sharing some data, files, confidential details with you? What was the reason, or fear or rationalisation for this?
Be generic as you need to be. DM me if you don't want to post to the public forum. Was there anything that could have changed their mind but just wasn't accessible or possible? This doesn't have to be a technical thing, but something that you knew would have made them feel more comfortable in giving you this information that wasn't there at the time.
Asking for a friend... or surreptitiously scoping out a possible project. Who knows?