That's a theory.
But if my photo is good, and people search images, then it places your account as one more obstacle in my way, potentially sending people to your account first, instead of my site.
Because it places multiples of a single photo online in more than one place.
I like the other way better than I list on my photo policy page. My images are available for many things, provided people link back to my site with the specific text link requested. And that places the images and links on many different sites, than just one or two types of site.
At my own site, I've merely linked to other people's photos, not even showing the image on my page, and found that Google Images sometimes gives me the greater advantage than the person who owns and hosts the image at their site.