~~~
In the case of Ronaldo everything might not be so straightforward. On the one hand he did not want to play in such a weak Manchester United but on the other hand it was Ten Hag's actions that became decisive in Ronaldo being suspended from the team and training. Most likely Ronaldo understood that he had no prospects there and he wanted more and he should not be blamed for that while Ten Hag just wanted to preserve his authority in the team so everything is clear here.
In fact, the tension between Ronaldo and Ten Hag was due to a trivial problem at the training ground, Ten Hag differences in views and leadership style with Ronaldo attitude as a mega star caused the dispute to have a big impact. Ten Hag wanted to discipline the players with a strict philosophy, but Ronaldo felt pressured by the rules because of his status as a legend at MU and world football, this difference of opinion made Ronaldo leave before his contract ended.
I don't want to blame Ronaldo or Ten Hag because both of them feel that their positions are correct, if at that time Ten Hag had given Ronaldo freedom, maybe Man United wouldn't be like they are now, new players would also be easier to bring in because they have the opportunity to play with Ronaldo.