I just stumbled upon this video where the hosts are talking about a graph showing a graph what 4-digit pin numbers are mostly used.
might be interesting for some here :-)
Video: https://www.youtube.com/watch?v=Qj85v2ca89E
Graph: https://old.reddit.com/r/dataisbeautiful/comments/1cn7l7r/oc_most_common_4_digit_pin_numbers_from_an/