I don't think authorities worry about I2P at this point, it is too small and requires some technical expertise to use. It is however much more anonymous and pri

I don't think authorities worry about I2P at this point, it is too small and requires some technical expertise to use. It is however much more anonymous and privacy-preserving than Tor, so yes, some corners are dark enough (you will rarely encounter them unless you want to go there, and from technical point of view, I2P is really interesting).