Can someone explain to somewhat of a layman in terms of security/privacy, why isn't there a bigger push to adopt http://www.i2p2.de/ http://www.i2p2.de/ ? Also

Can someone explain to somewhat of a layman in terms of security/privacy, why isn't there a bigger push to adopt http://www.i2p2.de/ http://www.i2p2.de/ ? Also, how solid is it? I suppose Tor has attracted much more research over the years in comparison.