Leaks are terabytes in size. Of course he's gonna provide a small sample and then wait for the news organization to provide him a secure way to transfer it all.
Say you got your hands on 2.6 terabytes leak. Where would you upload it before approaching a news org while preserving your identity? And keep in mind that your average leaker is probably less tech-savvy than your average HN viewer.
It's unclear if even a sample was provided, but yes, in general with Wikileaks the idea is to throw all the data over the fence to them, and let them take care of the rest. Trying to negotiate terms of how the data should be released etc is a non-starter.
Cool, say you've done so despite obvious issues (no microSD is over 1 TB, since TrueCrypt is no more there's no obvious trusted encryption software for that sort of thing, then there's borders, being on a security camera at a post office, etc).
Which address would you ship it it to so it reaches Wikileaks?
So you need to send two microsds, fine. You'll probably want to use something more trustworthy like luks with a detached header and a largeish offset. Finally, drive some tens of kilometres and throw it into a mailbox somewhere in the fields at 3 o'clock.
I don't know what address wikileaks has, but then again I never tried to contact them.
Say you got your hands on 2.6 terabytes leak. Where would you upload it before approaching a news org while preserving your identity? And keep in mind that your average leaker is probably less tech-savvy than your average HN viewer.