I mean they could just provide a link and a code and non-google accounts require the code... It should probably at least be an option. I guess once you've shar

I mean they could just provide a link and a code and non-google accounts require the code... It should probably at least be an option. I guess once you've shared those photos it's only trust that protects them anyway and in a group where you don't have full trust, you should assume that the photos are essentially public with only security by obscurity. I mean the hash lengths and the blocking of people hitting random hashes is probably more significant and I imagine Google have considered it.