Why
It's not because the Feds can suddenly crack all encryption - this doesn't make it any easier for N Korea to get pgp.
What it does prevent is some embarrasing cases where major bits of open source software couldn't be hosted in the US because the license said free to anyone but the US made you click a bunch of disclaimers that you wouldn't use it to build WMD or export it to N Korea.
It also meant somebody could in theory sue any US company for violating the GPL - they are using the GPL software but cannot distribute their changes - because they can't be exported.
So you could go after Oracle, IBM, etc and possibly get some judge to block them using FOSS whileit's all sorted out (or until they settled out of court with you)