I remember spending a long time (probably 2-3 years) on Reddit as a lurker before starting to comment on things. Posting was an even bigger hurdle to get over.
There is no karma system, so there isn’t any “reward” for submitting posts other than getting to inform people and potentially spark discussions. Similarly, comments are basically only good if you actually get responses. When there’s such little activity going on, it gets pretty unlikely, unless a group of people just start forcing themselves to respond to others.
I do find myself commenting more on smaller communities, mostly because they’re more aligned with my niche interests. And larger communities get toxic really fast; politics and news just get so, so messy.
If I had to guess, half of my posts are just on the MtG instance, which doesn’t quite have critical mass for discussion yet.
I should probably tune in for weekly “What are you reading/playing/watching” threads a little more often.