http://10channel.i2p/res/2884.html
So if we combine the demand for digital freedom, relative difficulty of using I2P compared to modern web and its relative obscurity and thus enough people around with some digital skills, nostalgia about the old web, then we get a noticeable proportion of russian resources around. And let's not forget that there is another C++ I2P implementation (i2pd) that is maintained by a russian guy and some other fellow contributors.