The site in question isn't even talking about web apps. They're talking about telemetry in tools commonly used to build webapps, which is perhaps more surprising.
The Next.js CLI phones home to Vercel with statistics about how many times e.g. `next dev` is being called, along with details of the developer's OS and CPU, as well as what Next.js plugins they're using in their project.
The Next.js CLI phones home to Vercel with statistics about how many times e.g. `next dev` is being called, along with details of the developer's OS and CPU, as well as what Next.js plugins they're using in their project.