Vercel

Features work seamlessly on Vercel but become problematic when deployed elsewhere, creating tight coupling to Vercel's infrastructure. Some developers have inherited projects so tightly coupled to Vercel that migrating to other hosting providers like AWS proved nearly impossible, sometimes requiring complete rewrites.

Vercel's usage dashboard shows metrics like 'Fluid Active CPU' and 'ISR Writes' without clear documentation on how they impact costs or how to optimize them. Developers pay subscription fees but lack visibility into what drives spending, making budgeting impossible.