It is. People suck at being random, so there's a good chance that those "false positives" will actually be trivially filtered out. And even if not immediately, this is an algorithmic problem - they will just throw few dozen kUSD at some math and CS graduates to make it go away.
I agree with you and TemPorAL (apologies for incorrect capitalisation!) that these are probably a waste of time for the user - they don't work.
NSA and GCHQ are very good at math - I'm constantly surprised that people don't appear to get this. Maybe it's because secret government agencies don't publish much?
Just for fun here's one extension: (http://trackmenot.org/) (https://cs.nyu.edu/trackmenot/)
People can probably come up with ways to improve it. But still, these are probably pointless measures.
I want to say a sentence to someone, but in order for an unintended listener not to understand what I'm saying I will say 10 sentences. Five of which will be "I will kill you and everyone you know" and "I will bomb America".
Isn't that just a meaningless waste of energy?
-- The government spies on you because you make it easy for it to do it. Instead, keep your personal data personal, use encryption and there's not much more that it can do, without becoming physical... ( it has no problem doing that either, but at least its intentions will be more obvious that way, and hopefully will wake up all the ignorants that think that some old guys peeking into everyone's lives is justified).