Think about it: Lemmy provides you with a ready-made frontend and backend — all you have to do is host your own instance of it. The following could all have been implemented as Lemmy instances, had it existed at the time:

• Reddit (www.reddit.com)
• Quora (www.quora.com)
• Stack Exchange (stackexchange.com)
• 4chan (www.4chan.org)
• Disqus (disqus.com)
• Hacker News (news.ycombinator.com)
• Something Awful (forums.somethingawful.com)
• GameFAQs (www.gamefaqs.com)
• Bodybuilding.com Forum (forum.bodybuilding.com)
• Gaia Online (www.gaiaonline.com)
• IGN Boards (www.ign.com/boards)
• NeoGAF (www.neogaf.com)
• MacRumors Forums (forums.macrumors.com)
• Digital Spy Forums (forums.digitalspy.com)
• WebmasterWorld (www.webmasterworld.com)
• AVForums (www.avforums.com)
• DeviantArt Forum (forum.deviantart.com)
• XDA Developers Forum (forum.xda-developers.com)
• WordPress Support Forums (wordpress.org/support)
• The Student Room (www.thestudentroom.co.uk)

Of course, these all have very different rules and frontends, but those can still be changed.

In addition, members of other instances can visit these forums without having to create new accounts, thanks to everything being federated.

Isn’t that cool?