Correct, Google doesn't want to have pictures in its database. Only plain text is reported.
Every single installation of Google chrome gets an unique ID. This ID represents and entry in the Google database.
Google mainly collects urls you visited, what you entered in search bars, etc.
These information are then used for various activities, but mainly to give you advertisement that has to do with search queries you made or homepages you visited. It is then more likely that you will follow the advertisement link, which means money for Google (which is what this all about, after all. Google doesnt provide you with useful software because it likes you so much
). Your Google profile will also be used to "optimize" your search results.
If you upload a picture to somewhere, Google will find it sooner or later.
Google has little programs, called "web spiders" that "crawl" thru the internet and make a backup of every homepage they come across onto a Google server. This is how Google cache works.
And here`s the little snag: you cant really delete these backups of your homepage/pictures. Google won`t delete the data, even if you delete your homepage.
f.