Unless explicitly declassified the leaked information remains classified, and those who hold security clearances are legally required to avoid all classified information outside of their need-to-know [0].
Now if you have never held a U.S. security clearance, you're less likely to be prosecuted but the history and precedent is murky [1]. The average Joe Sixpack checking out Wikileaks is probably safe, but if I were a journalist publishing the next round of Pentagon Papers I would much rather have a small army of lawyers and a friend or two in Congress.
EDIT - Google has federal contracts, so they are probably bound by similar agreements to at least make an effort to avoid any such leaks in their training data for public-facing models.
[0] https://www.csmonitor.com/USA/Foreign-Policy/2010/1207/US-to...
[1] https://www.npr.org/sections/thetwo-way/2017/03/22/521009791...