Only a fraction of any users on any platform actually post anything. You can already see that number of posts isn’t slowing in the third graph.
This is a perfectly healthy for a new platform in a competitive environment.
Look at Twitter’s early growth for a similar story.
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Here’s tweets over that period + further
I’ve been using portainer for this and really like it. It does tether you into using docker images but that’s not really a bad thing nowadays.