I'd say it was more the manner in which they were moved on.
Like
@theshed mentioned they were guys respected in the playing group or had been at the club for awhile that were cast aside for young dudes that had done nothing.
Kodi basically being told he would be a bench player, instead of just telling him he was bench for now but things can change
Kahu being told he was depth and then having his move done so quickly that he didn't even say goodbye to the group.
Macca being told he was depth only and no chance of getting the starting position.
Sua being told he was depth and then trying to shoehorn him into the middle rotation after a broken ankle
The coach being unable to control Roberts and basically having to move him on.
Them trying to move Glenn on only to realise they needed a captain
Everything was pointing at the club being run as a business with zero loyalty. It's any wonder players are now treating any dealings with the club like a business knowing the club will just move them on when they're no longer needed.