I see lots of communities with hundreds of subscribers, but no posts. What is with that? If you’re going to register a community, at least help it get going. Post some content regularly, until it becomes self-sustaining. It’s disappointing to open a community with hundreds of subscribers and not a single post.
The reason why other communities/social media sites have so much content is that they’re massive with millions, or in the case of Facebook, BILLIONS of users. Lemmy/Kbin is a fraction of a fraction by comparison, and people are mostly used to browsing without contributing. New platforms tend to suffer because of this and ultimately die off. You need that snowball effect to happen quickly like what is happening right now on Threads. Sadly only established mega corps have a good chance at succeeding in the long run.
Those platforms die off because they have a profit motive. No content -> no profit -> no platform.
Admins can stop paying their hosting bills and drop from the network, but FOSS doesn’t have that problem. It exists for the sake of existence.