I2p is not a substitution for a proxy. I2p is an end-to-end encryption Network and unless it's changed over the past couple of years it's incredibly slow for any multimedia transfer. Coupled on top of that you have to have the knowledge to be able to set up your full system to route all traffic through it. So using it as a a security step for most people is already out of the question. It's not like a VPN where you can just plug and play. Having your entire network communicate through l2p is going to make everything substantially slower.