Best part? The description supplied here is probably a limited version of all the information that Google infers from each of your photographs. It would make sense to ask for a short 3 paragraph summary of key observations to fit within API limits. On Google’s end? No reason for such limits to exist. So they infer even more from your data than this website can show. And they run this kind of compute on everything you give them.
They “claim” that they don’t sell or share this data. Do you trust them?
You might say you have nothing to hide, but you also don’t get to control the shifting definitions of what’s acceptable. Today you’re fine. Tomorrow you’re labeled a political dissident because of the evidence of Wrongthink that Google happily supplied to the government without your knowledge. Especially in light of the incoming administration, this is an important discussion to have.
Here is a list of FOSS Google Photos alternatives. Immich looks particularly good to me.
Obviously, don’t upload any photos to the demo site that you wouldn’t want shared. That’s pretty basic internet 101. The point is to demonstrate the amount and types of information Google infers from its users’ data. So feed it a pic you don’t care about, or try with the supplied images.