“Lemmy” is actually not a platform like Reddit, it’s software and the network of instances running that software is decentralized (Lemmy uses the ActivityPub protocol) meaning each instance is operated by a different person (or group). There are also other similar softwares like Piefed and mBin that work pretty well with Lemmy. That is all to say that if an Admin or Mod is “getting fascisty” you can block that instance, join another, or even create your own. That’s the beauty of ActivityPub!
Because Mastodon is Twitter without the possibility of an Elon Musk and Lemmy/Piefed is Reddit without the possibility of a Steve Huffman. You clearly feel that you can do better than the collective efforts of the ActivityPub devs so I am rooting for you!