I would fully expect Linux content on any community dedicated to technology (i.e. programmerhumor); the rest is totally understandable. Though, I have to agree with @CarbonIceDragon, I really don’t see as much Linux content as you seem to - granted I use kbin, not lemmy.
I’ve read that Lemmy is a bit more personally curated than kbin, is it possible you’ve just accidentally built yourself a Linux bubble?
In this thread, everyone getting caught up on the first toot and not the second where he clarifies his point.
If you step past the initial investment of buying a house, the analogy makes perfect sense. When you rent an apartment, your landlord (the provider) takes care of all the maintenance; you just live there and you get what you get. When you own a home, you take care of all of the maintenance, but you get to set the place up however you like. This isn’t that different from a lot of FOSS out there.