It comes amid fresh chaos at Twitter, which placed a limit on the number of tweets users can view.
Bluesky, a Jack Dorsey-backed Twitter rival, had to temporarily pause new sign-ups over the weekend after it reported a surge of interest.
"We will temporarily be pausing Bluesky sign-ups while our team continues to resolve the existing performance issues," Bluesky wrote in a post on the platform.
On Friday, Twitter started requiring people to sign in to view tweets on the platform, a move that irritated some users.
However, unlike Mastodon, users don't have to choose a server when they sign up – something that appeared to be an issue for Mastodon users who found the process too complicated.
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