TensorFlow

Key corporate backers (Google TensorFlow, Microsoft PyTorch) shifted to competing languages/frameworks. Maintainer burnout led to stalled updates (Django), abandoned libraries, and forced teams to maintain forks or rewrite codebases.

Python's accessibility flooded the market with junior developers, creating intense competition for entry-level roles. Companies migrate to Go or Kotlin for performance/type safety, and AI startups prefer Julia/Rust, leaving Python devs maintaining legacy models.