Make sure that you have port forwarded ipv4, and are allowing inbound traffic on ipv6, then just set floodfill = true, bandwidth = X, and share = 100 in your /etc/i2pd/i2pd.conf, then just restart and you should be good to go.
You may also need to increase the default open files limit with a service file dropin, the default is already increased, so if it doesnt cause any issues, you dont need to touch it
What a shame, I was really excited for this game, I have over 1k hours in MSC, got my license before Steam even had an AI disclosure and had no clue about the hallway paintings. Im definitely not gonna be buying MWC or any other ai generated shovelware