Because for better or for worse, Lemmy needs to be able to sustain itself and not have to rely on Reddit for content. Personally I’m really enjoying Lemmy so far.
Adding on to this: I’d rather see the Fediverse not become just Reddit 2.0. I personally very much like the vibes and communities we already got going on already.
I really, really don't want the current Reddit where admin allows blatant adverts in posts, racism and homophobia and bans people who encourage protests.