They are bought and paid for by the time they get nominated.
But don't feel too great. It's doubtful the US will survive if the elite backstabbers don't realize us voting fodder aren't voting for them anymore if they steal the nomination. And if this later-ballot BS with Trojan delegates happens? Yeah, that qualifies as stealing the nomination.
I think then that there is a reason why it is called a ‘Party’.
If this is truly what he is trying to do, then he needs to go get his own ‘Party’.