Hi, I'm the upstream dev for I2P Our package was removed due to FTBFS https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=997213 due to a change in a dependent package.
It's an easy fix to the i2p control file, the fix is at the bottom of the link above. Unfortunately our maintainer has been unresponsive for over a year. Looking for a volunteer to fix and restore the package, or even better to bring it up-to-date, using the latest package from our repo https://deb.i2p2.de/ which contains the fix and a year's worth of changes. thanks!
