"posting the source code in a way that would allow people to reverse engineer
the code to produce bogus scientific results would make the whole project
pointless."
https://foldingathome.org/faqs/project-details/dont-post-source-code/
Have these people not heard of BitCoin? There are definitely ways to verify
the results coming into their system and if they're not using them, they're a
bit naive. Not publishing the source code under a free license doesn't do a
single thing to prevent Bad Actors from reverse engineering their software
and feeding them bogus results. Class security-by-obscurity.