Great game that is a horror shooter, but I wouldn't call it a MilSim though. MilSims are usually games like Arma or Squad.
This is the fallout from the technology industry shrinking and coming to terms with itself. See the crash of the Silicon Bank recently as an example. Basically as the positive outlook toward these kind of businesses and pursuits continues to mellow out we'll see these companies look inward to squeeze as much money out of their products as possible.
The reality is that there was/is no reddit alternative and right now we're all in this transitory phase where we're all looking for a new home. We'll all just have to wait for the dust to settle. Lemmy isn't perfect but is improving and additionally other alternatives like kbin and tildes are in the works.
To your larger point, much of what you're feeling is the abrupt break in habits. I've been using the gap to develop more positives ones, and it's been great.