Of course, at this level of the competition, you just want to win the trophy and for some teams, they just aim to get into the quarter finals at least because they know better. I wouldn’t want to name any team but speculatively, not all teams do play for the trophy. Especially, when playing their local leagues, quite a few would be in the business of selling new talents in the transfer market and remaining relevant in their league.
Typically, teams that aren't playing for trophies are teams that are aware that their own abilities aren't yet sufficient to reach the final, so they monitor new players with greater ability in each match. But in a competition as high as the Champions League, it seems like every team is trying their best, even if they ultimately lose to stronger opponents. Still, when playing in the Champions League, everyone will be willing to give their all, relentlessly, to win. In the Champions League, besides having to be clever in rotating players, they also need to have stronger players.