One can guarantee if anyone attempts to secure or harden TOR or any other onion product enough to ensue the TLAs can't gain access they will be visited by some "Men in Black" with some NSLs to hand out. Never to be seen again! The TOR site need to have a Warrant canary "https://en.wikipedia.org/wiki/Warrant_canary"
specific to this situation, unless they already have been issued NSL or other mandates, then all bets are off, probably the latter!
It's a shame the Gov. thinks it's the boss, the people are the boss, the constitution clearly says so! This is not for our own good, it's for the Gov. spying operations, and we already have way too much of that!