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thank you for report, i think the "s=0" is best quality
Oh wow I found out that it works on banners YouTube banners as well!
I wonder what else this update affects google's images!
YouTube Gaming covers
sometimes on a YouTube video there are video game covers in the description
if you go to the page for that game on gaming.youtube.com the cover is larger
in description image:
https://yt3.ggpht.com/a5jx_K5RIOEJ8o1OHxYUeO5jGef_9zzIAdI_AV9Jax1LWfZfqxJSkvG5WOzWjTZoSVqkl4ZQaj4thHRZQfM=w40-nd
on gaming.youtube page:
https://yt3.ggpht.com/a5jx_K5RIOEJ8o1OHxYUeO5jGef_9zzIAdI_AV9Jax1LWfZfqxJSkvG5WOzWjTZoSVqkl4ZQaj4thHRZQfM=s256-nd-rj
I managed to make the cover bigger by removing "=s256-nd-rj"
https://yt3.ggpht.com/a5jx_K5RIOEJ8o1OHxYUeO5jGef_9zzIAdI_AV9Jax1LWfZfqxJSkvG5WOzWjTZoSVqkl4ZQaj4thHRZQfM
I made it bigger by changing "=s256-nd-rj" to bigger numbers examples:
https://yt3.ggpht.com/a5jx_K5RIOEJ8o1OHxYUeO5jGef_9zzIAdI_AV9Jax1LWfZfqxJSkvG5WOzWjTZoSVqkl4ZQaj4thHRZQfM=s1000-nd-rj
https://yt3.ggpht.com/a5jx_K5RIOEJ8o1OHxYUeO5jGef_9zzIAdI_AV9Jax1LWfZfqxJSkvG5WOzWjTZoSVqkl4ZQaj4thHRZQfM=s2000-nd-rj
the "s" prefix seems to influence the height of the image
I don't know if there is a way to find the biggest image but this is something I discovered!