Mir

Canonical's history of proprietary server-side components (Snap), closed-source backends, and failed attempts at ecosystem control (Mir, Unity, Amazon integration) signal a 'not made here' mentality that contradicts open-source values and discourages community adoption.

Ubuntu frequently makes core system modifications (e.g., for Mir, Unity, Wayland) that are not contributed upstream, preventing other distributions from adopting Ubuntu innovations and creating maintenance burden.