Not sure, exactly. One mod said it's too buggy, basically. Though, considering how much they complain about the big Reddit Mods and so on and so forth and talk a big game when it comes to transparency and so on, it's 100% reasonable, as well as entirely prudent and important - even vital - to have a (more) decentralized (you know, "web3" -esque), federated platform to discuss the whole GameStop thing.
The fact that they censor the word "Lemmy" and other hinting towards it from anyone tells you everything you need to know.