So, you're not granting them ownership, just a perpetual right to publish, display, modify and publicly perform anything you upload so long as the use has to do

So, you're not granting them ownership, just a perpetual right to publish, display, modify and publicly perform anything you upload so long as the use has to do with "operating [or] promoting" Google's services? I guess the difference is significant in that they can't prevent you from using your property, but I still feel like you're kind of being obtuse if you think this negates people's concerns.