Welcome! Lemmy is smaller than Reddit but better in many ways.
I moved from Reddit to Lemmy when the 3rd party apps were shut down 1 and a half years ago, and have grown to love Lemmy, and especially how it's run.
On Reddit, Corporate goons get to decide everything. Reddit is one website, controlled by Spez and his admin team. Lemmy is not controlled by any single individual. Lemmy is a software that anyone can decide to host. Lemmy.world is hosted by a guy in Europe, but you'll see there are servers in Canada, and LGBT servers, tech servers - they are all Lemmy, but descentralized. I'm not the best person to explain it, but I encourage you to discover Lemmy for yourself if Reddit is censoring subs about Luigi.
If you ever want to share/comment/see a copy of Luigi's manifesto, Ken Klippenstein is the original source, but this is a space to freely speak and share your memes, your dialogue, anything that you want!
I think the rules are basically don't advocate or organize attacks on people. Here are the ToS if you need them. https://legal.lemmy.world/tos/ But basically be a decent, rational person, and expect the same from others.
The bigger communities on lemmy are sympathetic towards Luigi, and freedom from reddit censorship. Lemmy is smaller than Reddit, so the niche communities aren't as active as on Reddit, but lemmy.world/c/lemmyshitpost, lemmy.world/c/news, lemmy.world/c/memes have a lot of solidarity and are active enough, even if the niche community isn't.
I had a similar situation. I used the Reddit is Fun app for 12 years, and spent a lot of time on it. When it was shut down, I moved to Lemmy and never participated on Reddit again. Until today. I found out about the Luigi censorship over there, and told a niche subreddit to come over to Lemmy, and created this community (even though I know the larger communities are probably a better place for engagement)
I would like to see more people from Reddit learn about Lemmy.