@Hyolobrika I would say merely because GNUnet is a GNU project and is under fine copyleft licenses and not under the less free MIT expat (as that license seems to overstep and say that copyright law applies to merely using software).

Another reason is that it looks like reticulum is developed on the proprietary github (a huge red flag that something is amiss).

Going at the technical angle, GNUnet is both a networking stack and also a set of application protocols on top (including a DNS replacement), with decent performance (as most of the software is written in C).

Meanwhile, Reticulum seems to be "only" a networking stack and is written in mostly python (which should be fine for small amounts of packets, but performance will becomes a problem if you want to route a huge amount of packets).