It’s because Lemmy is a techy tinkering hub. The same skills and interests needed to be aware of and migrate to Lemmy lend themselves to people migrating to Linux.

Both are free and open source and arguably better than the alternatives of reddit and windows so of course there are a bunch of dorks on here trying to get you to switch.

Both also cut down on how much you can be spied on and manipulated by algorithms so that’s a big incentive to convert people too.

Edit: btw you should switch to linux