TechCrunch highlights the worst data breaches of 2024, including 23andMe's massive theft of genetic data affecting 7 million users and Change Healthcare's seven-month delay in revealing a breach of over 100 million health records. Synnovis faced severe disruptions in U.K. healthcare services due to a ransomware attack, while Snowflake's customers, including AT&T, were targeted in a series of hacks. Columbus, Ohio, controversially sued a researcher for exposing data vulnerabilities. The year concluded with MoneyGram suffering a breach impacting customer transaction data and Hot Topic's silence following a leak of 57 million records.