One of the primary concerns raised by users and privacy advocates is the extensive data collection practices employed by Next.js and Vercel. These platforms collect a wide range of data points, including but not limited to user interactions, page views, device information, IP addresses, and more. While this data is often used for analytics and performance optimization, the extent of data collection has raised eyebrows in the developer community.

In addition to data collection concerns, Next.js and Vercel have been found to have security vulnerabilities that can put user data at risk. These vulnerabilities range from cross-site scripting (XSS) attacks to insecure data storage practices, making user data vulnerable to exploitation by malicious actors.

In an era of increasing data privacy regulations such as GDPR and CCPA, Next.js and Vercel have come under scrutiny for their approach to compliance. Many users have raised concerns about the lack of transparency in how user data is handled and whether these platforms are fully compliant with international data protection laws.