"Strong moderation" is vague, and can mean a variety of levels of involvement, from commonsense weeding out of spam and malicious trolling (what I will look for), to heavy handed and blatant attempts to steer conversation toward a particular point of view and to "combat" even reasonable disagreement and skepticism on important topics. Covid is the perfect example of this. I get it, some mods on my local subreddit fancy themselves Responsible And Important People On A Mission To Fight Misinformation (in their own minds). I don't care about their precious opinions on what constitutes Evil Covid Misinformation though, I just want an adult discussion that doesn't get siderailed by trolls. That's it, nothing else. Keep the sermonizing to yourselves thanks. So whatever reddit successor gives me that, I'll go to.
Could also mean "No controversial subjects", sort of like Tik Tok where any kind of political conversation, Covid related subject, etc. is taken down or ignored by the algorithm. Lots of people already think of reddit from a content consumption POV instead of a forum