Man United don’t share tactics online because they don’t want Man City knowing them.
They hoard information in order to win.
Contrary to this, the skill levels of skateboarding grew exponentially with the arrival of the Internet.
All the skaters could see what tricks everyone else was doing, learn how to do them and so the rising tide brought up all boats.
Thereby making skateboarding more competitive.
Therefore, in that regard, Man United could benefit all of football by broadcasting their trainings and publishing their strategies online.
Additionally the sharing of all their secrets could push them to be better, to find new solutions or perfect strategies so even when the opposition know them they can still win using them because they’ve become so good at them.
Thomas Duggan 