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True, the official adapter is only 3A, while this one is 3.5. But the official one sits flat and stable, while this one has that annoying plastic protrusion that makes it unstable and wobble and eventually work itself loose from a jack. It's therefore unsafe.
I ordered 2 of these power supplies back in January and immediately used one of them for a pi4 I was working with, today (7 months later) I just opened the box of the second one and it doesn't work at all. Learned my lesson--try it when you buy it, not several months later!