Mastodon was first released in 2016, by 2022 it had 4.5 million users, given the social media shift the entire fediverse has grown to around 13 million users in 2023.
Instagram Threads got 100 million users on its first week. Twitter has 450 million active users on July 2023. Facebook has 2.5 BILLION users.
I don’t think anyone is worried about the Fediverse, and I’m glad, I enjoy the less noisy ambience here.