Well outproxying suffers from a lack of exit diversity, and Tor Bridges suffer from potential enumeration issues. By running a Tor Bridge over I2P, the bridge can be hidden from the client that's using it. By connecting to a Tor Bridge over I2P, the client connection to the Tor Bridge is obfuscated within an I2P connection and decoupled from the real address of the Tor Bridge.

Beside that, many existing I2P outproxies dump the incoming traffic to Tor for the protection of the outproxy operator or to provide access to .onion services. The problem with that is that it puts us in a position to read informaion about the .onion sites you visit. Honestly it gives us a lot of power we'd be better off without.

Ultimately, combined with a safe mode of mixing I2P and Tor traffic in the same application it might be a more reasonable way of offering Tor as a backup for clearnet connections over I2P.

How?

It's not entirely ready yet. I need to figure out the AppArmor profiles. But once that's done it should work using the example torrc from torrc.d/torrc.