Cristiano Ronaldo played well for Manchester United but they perhaps created pressure and forced him to leave by seeing his playing style does not contribute too good things for the team in general. It can be a good assessment on Cristiano Ronaldo's contribution for their club but they failed to replace Cristiano Ronaldo. Seasons later, they still did not find any good striker who can score goals regularly for them like Cristiano.
This made their decision and bad treatment on Cristiano Ronaldo are like a massive failure and their club are still in a big crisis, not only at a striker position, but the other positions. Ruben Amorim will face with a lot of tasks and pressure to do well in a new season with his mission of rescuing Manchester United.
The fact that good players in the long run want to make as much money as possible, there is no longer any attachment to the shirt or the fans, there is nothing.
In Italy, the latest example of a Saudi acquisition was Mateo Retegui, who didn't even think twice about it and left immediately.