Even using encryption that is trivially defeated is effective at resisting broadly applied surveillance as long as the fact that it's trivially defeated isn't p

Even using encryption that is trivially defeated is effective at resisting broadly applied surveillance as long as the fact that it's trivially defeated isn't public. That's because you need to restrict the application of the technique to a rather limited circle to maintain secrecy, which more or less guarantees that it's only applied in a targeted fashion.