Google most definitely had input in the creation of the format, but from all I can research, only at an early stage. As the project grew away from Pik they seem to have dropped interest and moved away from it.
I have updated the article with more details about their involvement for transparency.
If you have any information you can share with further information regarding Google's input, I'd open to hear it as evidence of their input as a company beyond preliminary stages has been difficult to find.
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Regarding JPEG XL's mobile support, it makes sense it would see limited development if the company that manages one of the biggest mobile players has been the greatest restriction on their success. The lack of support also disincentivises manufacturers to prioritise support.
I have updated the article with more details about their involvement for transparency.
If you have any information you can share with further information regarding Google's input, I'd open to hear it as evidence of their input as a company beyond preliminary stages has been difficult to find.
---
Regarding JPEG XL's mobile support, it makes sense it would see limited development if the company that manages one of the biggest mobile players has been the greatest restriction on their success. The lack of support also disincentivises manufacturers to prioritise support.