It is not similar imho. First NextJS build system is not really exposed apart from a simple docker example and all advanced features of NextJS is kinda coupled to Vercel. For Astro it is just a Vite project with integration designed from day mind they would have to rip everything apart and that would probably cause a prominent fork. The other part is Cloudflare is not dependent Astro being vendor locked as much as Vercel being dependent on NextJS being vendor locked.