Because Dropbox acquired Boxcryptor -- one of the tools that easily let people encrypt files before upload -- to be replaced with "plans for end-to-end encryption"
The challenges with the post's suggestion are (1) it accounts only for the time of the person needing information, not the one providing it, and (2) a specific question takes a small time to answer, but pre-documenting everything that is needed to answer any question takes orders of magnitude more time.
Some of this is outlined in Snowden's (not that Snowden) Laws of Knowledge Management.
Here, we propose that glyphosate is the most important causal factor in this [celiac disease and gluten intolerance] epidemic.