Bluesky's rapid growth can be attributed to a combination of factors. One reason is the controversy surrounding X's decision to change its block function, which has left many users feeling unsafe and vulnerable to harassment and abuse. This change has led to widespread criticism and a loss of trust among users, who are seeking a more secure and respectful online environment. Additionally, X's updated terms of Service and privacy policy, which allows the company to share user data with third-party companies, has raised concerns among users about their privacy and data security.