I'm not exactly sure how you think these examples justify the author's claim, can you elaborate? Cause it seems like what you're doing is the equivalent of poi

I'm not exactly sure how you think these examples justify the author's claim, can you elaborate? Cause it seems like what you're doing is the equivalent of pointing to an example of someone killing another person and then saying "gotcha! see how the existence of police and murder laws don't completely prevent murder?" The underlying question is does the walled garden approach improve the security and privacy of the overall ecosystem compared to the non-walled alternative, not whether it leads to 100% perfect security and privacy (which is an unobtainable ideal).