If I was to be charitable, it's because it could be easily buried releasing it all at once

People are stupid and lazy, if you give them a lot information all at once and tell them to search through it, large majority will go 'no' and wait for someone else to do it for them

By drip feeding it this way, keeps people engaged, coming back to the platform constantly to see each drop and leaves time for them to be 'outraged', stir some drama then release the next part when it's dying down.