I also don't understand the greed by Manchester City... They've already signed James Trafford for 30m euros. They have a backup goalkeeper who is Ortega also.
Then why are they going for Donnarumma too?

I don't think Trafford would be happy about giving his starting eleven place to him.
I'd rather see Manchester United going for the Italian goalkeeper as they need the most now.
Greedy? What greedy are you referring to here, a team is trying to sign players in sensitive areas and you're saying they are greedy, no they are not. Manchester City or should I say Pep is no longer comfortable with Ederson in front of goal and wants a chance that's why they are pushing hard to get Donnarumma from PSG before the window closes. Ortega is not even in City's plans and their new goalkeeper can't start handling first team matches yet that's why they are going for Donnarumma.
I understand him, but he is just missing a point. They are letting Ortega go, that is already done, Ortega has been told to find a team already. They planned on having Trafford and Ederson at goal, changing based on the game, Trafford is younger, Ederson is older, and they hoped to have Trafford be great as much as he can with time. Like at least make it so that they can do better job, so that would be important thing for the future, growing their own talent for a while.
Donnaruma is a weird situation, that was something nobody expected, city couldn't have known that would happen, so they were caught off-guard like all of us and now they are realizing there is a chance they can get him, and that is definitely a huge plus.