One that I can think of rn, is @CannotSleep420 's lemmy-bot, as well as ridoukousage’s TLDR bot.
With the web being so ad-infested and completely owned by google, people have noted how the TLDR bot means they often don’t have to leave their lemmy app at all, and can stay behind its privacy shield.
While of course I do think we can code a lot of functionality directly in to lemmy in a way that we couldn’t with reddit, there’s undeniably a lot of potential with bots that can do different things for us.