Stuffing an SSD Inside the Raspberry Pi 400 (2021)
tdarb.org
tdarb.org
Google doesn't produce things out of altruism. They've been a bad actor in enough cases for a long enough time that there's no reason to trust their motivation.
Webp is not a standard. It's marginally open source but it's entirely Google driven for Google purposes.
Jpeg is a standard. Contributing to the development of existing standards is what participation in the open web looks like.
Webp is like AMP. It's unnecessary. It's a waste of time and energy. It's not clear what Google's motives are for using or advocating for webp.
My perspective is very simple. Google wants an efficient storage and transmission format as they do lots of both. This is not contrary to the needs of consumers.
Here's an issue thread[0] on w3c/epub-specs that has some of the finer points.