Fortunately, I only get the popup when Chrome opens a pdf inside a window, but still that's about 25 times a day for me on average; could be 50 or more depending on what work I'm doing. It is extremely annoying, and the little "x" to close the box is tricky to catch just right and get the cursor to change to the hand symbol. So it does feel sneaky and spammy and tricky. That may be why so many of us are just very irritated at it. Multiple openings, that spammy, sneaky, tricky feeling, all at once can make a product just feel cheap.