that’s exactly what assange did with his insurance file, and the guardian editor he was in contact with published the password for the archive of unredacted diplomatic cables in a book
I can imagine a file-hosting blockchain platform that pays out people who host, and charges people who request files. The tokens to participate in the service then get sold on the usual exchanges.
Possibly, depends on how generic a drone you can get though, it might be possible to trace through the drone purchase and/or serial number. If you don't care about time and are willing to spend a bit of money, you could potentially attach an automatic wifi connecting and uploading raspberry pi or similar to the underside of a random car and just let it drive around. In most cities it'll eventually park near an open wifi. You might want to deploy two or three I guess.
Just put it up as a torrent and share the magnet link.