Ethereum co-founder Vitalik Buterin is raising alarms on Elon Musk’s recent wave of Twitter censorship, stating that the site’s barrage of account bans over the last few days are putting Twitter on “the path to authoritarianism.”

In response to a post praising Musk, Buterin said Musk was deploying a strategy he calls “central planning as overfitting,” where Musk introduces policies that are “seeming to retrofit around Elon’s views on very specific situations.”

The latest wave of censorship concerns began when Musk banned the account @ElonJets, which tracks Elon’s plane, as well as @CelebJets, which tracks the private jets of various celebrities. Such bot trackers pull publicly available information and repost it, which is legal in the U.S.