Porto was another European club eliminated. I guess the players thought enough is enough, let's go on vacation. Otherwise they wouldn't have conceded 4 goals against a team like Al-Ahly. Even if they had won, nothing would have changed because Inter Miami was leading 2-0 then conceded two goals in the last 10 minutes to draw the match and Inter Miami and Palmeiras advanced to the next round.
Atletico Madrid and Porto were the teams eliminated early. But this shouldn't come as a surprise. Not every player gives this tournament the same importance. You have to give credit to the players after a long league marathon. They need a vacation, they need to rest. Otherwise they are more likely to get injured.
Porto can't just help it because they have some good players missing out and their defense is nothing but shamble. The midfielders were not also helping the matter and can not even build a game. To be honest, I have not seen FC Porto as weak as this before. Al Ahly played a great game by the way and they could have scored more goals if there was more play time. Not that Al Ahly was too good for Porto to handle but FC Porto were just too bad recently.
As for Athletico Madrid, I don't know what exactly their problem is because they have some good players but it's disappointing watching them play. They could have won with three or more goals but they messed up their chances and thrown themselves out of the tournament this early. The only good thing about them in this competition is that they participated.