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.
Gonna quit weed. Cold turkey. If I don’t have control over my consumption now, I think that’s a sign I need to stop until I do have that ability again, if ever.