In November, Vince Knight decided he’d had enough of Twitter. After more than a decade on the social-media platform, Knight — a mathematician at Cardiff University, UK — was concerned about the site’s direction under its new owner, entrepreneur Elon Musk, who began laying off vast numbers of staff shortly after he acquired it. “Twitter is getting uncomfortable,” wrote Knight on the platform; he then jumped ship to Mastodon, a competing service. He says he simply didn’t want to support Musk’s Twitter any more.

The past few weeks have been tumultuous for Twitter. After Musk laid off staff, the site has repeatedly malfunctioned as the remaining engineers have struggled to keep on top of issues. Musk has also said he wants to take the platform in a new direction, encouraging accounts that were previously banned to return. Some reports, including one from researchers at Tufts University in Medford, Massachusetts, say abuse is rising on the platform