It’s fine, it just grabs the network settings from the gluetun service.
Btw, your post is hard to read due to formatting. Surround the code block with triple backticks at the top and bottom like this:
```
code goes here
```
Example:
services:
gluetun: # This config is for wireguard only tested with AirVPN
image: qmcgaw/gluetun
container_name: gluetun
...
ports:
- 8888:8112 # deluge web interface
- 58846:58846 # deluge RPC
deluge:
image: linuxserver/deluge:latest
container_name: deluge
...
network_mode: service:gluetun
Exactly. I have my firewall set up to block everything I don’t explicitly allow through. That way if I’m a little loose with running things on ports, it at least won’t leak ports past the firewall.