It wasn't a pre-order single there. It helps its chart positions by making it slower moving but damages its peak because it never has that frontloaded week. We saw the same thing with "Shake It Off" and it's a relatively new strategy for the streaming age.
LMLYD is still bigger and will remain bigger everywhere
I googled it too. My life will never be the same, what kind of secret? 
It's just no one called Bruno, Peter, since he was 2 y.o except his teachers at school.
