Non-patent-encumbered and standard are not the same thing at all. Platforms do not want to ship support for esoteric formats, and will fight back against adding anything not needed for long-term interoperability - for examples, see JPEG XL drama lately in Chrome.

This is for maintainability/security surface reasons as well as patent risks, as open/closed and standardized/bespoke axes have nothing to do with whether or not something is patent encumbered.