I disagree with your assertion that this is not about ownership. Each of those TOS agreements has the same canned phrase: [...] you grant us a non-exclusive,

I disagree with your assertion that this is not about ownership. Each of those TOS agreements has the same canned phrase: [...] you grant us a non-exclusive, transferable, sub-licensable, royalty-free [...] This is a weasel clause. "Yeah, you retain ownership, but you must also give us a license. But you still own it!" Rightttttttttttt.