It's less popular for several reasons: * Tor heavily used to get some anonymity in big internet. * Tor have bundle browser solution that anyone can use. * I2

It's less popular for several reasons: * Tor heavily used to get some anonymity in big internet. * Tor have bundle browser solution that anyone can use. * I2P is Java and not everyone know there is C++ client. * I2P also audited less have more undergoing changes. While I2P can be used to do exactly same things as Tor it's just not goal of project.