AROS AmiTCP is quite dated and porting up to date network code from other systems might be quite a challenge. (Old) Amiga sources should be easier. But keep endianess in mind.
Yeah I think DLG is a very much "by the books" app so in theory wouldn't present too many difficulties in porting once a suitable workflow for doing so is established.
IIRC, when the internet was becoming more of a thing, people were using telnetd.device rather than, or in conjunction with dialup access, if there is an equivalent or a port for AROS, this would provide a good starting point, if anyone wants to work on building this with me on an informal basis, we could maybe set something up on GitHub...
Amazing how times have changed in 30 years. I remember it taking an hour to download an ADF, nowadays I have a 10gb fibre fibre link directly from home to my colo 2km away