For me, it’s a few things.
- 
A way to burn time that doesn’t feel like a digital sugar rush. 
- 
Support, camaraderie, and kindness, primarily from /r/stopdrinking. 
- 
Niche stuff, like ideas for local hiking and backpacking trips, propaganda posters, and kayaking info. 


Your last couple of sentences resonate deeply. I was active like a decade ago. I remained active mostly in one sub, but only occasionally.
Here, it feels like I have to do my part.