When I shop Ebay I only use Ebay. My recommendation is never use google for Ebay shopping.
I tend to agree. Google's search has different priorities than eBay's search, so searching with Google will give higher ranking to pages that have been around a while and have lots of other pages pointing to them -- which may not be what you want if you are looking for newly listed items rather than older, ended ones.
But specifically for image search purposes, using something like Google Lens or Google's image search feature (or Bing's image search, or TinEye) can allow you to identify an item from a picture. Once you have obtained the proper name, you can then search eBay directly by keyword.
Having the image search built-in to the eBay app just made the process much easier to go directly from image to eBay listings without extra steps, at least when it was still available and working.
The last updates about eBay's image search feature can be found here:
https://community.ebay.com/t5/Android-App/Image-search-option-in-the-latest-version-of-the-app/td-p/...
Not much in the way of updates since December -- there is a link to a side-thread from January with some details of why the feature was removed, but minimal new info after that about when it might return.
