Explain value of earning vs being given?

My ex is bribing our 17 yo with money, new truck, no rules, 4wheeler, new iphone and tge list goes on. I have tried to show my kids that if you wabt something you should earn it. I want my children to have morals and integrity but i can't make him understand that he should finish school and get a job and work for those things. Thats how responsabile adults get what they want. How do i explain by enabling him she is hurting him in the long run? I told him to remember that whoever gives you something also has the power to take it away or say if it was not for me you would not have that but he thinks i'm wrong and being mean. Advice on explaining or dealing with this situation?

Added (1). Sorry for poor punctuation and typos. I'm using an old phone with a tiny keyboard while my other is being serviced.

If you "Earn it" you will "Take care of it" or else its just easy come, easy go and if they bust it they simply ask for a new one.

EARNING: working hard, getting what you deserve.

GIVEN: not working hard, getting what you don't deserve.

You can't do a darn thing about what your ex does, you can set rules and boundaries for what happens in your home though. You will probably not get far with empty threats or trying to put yourself above him with the "if it weren't for me" speech and really, do you want to show him that being an adult means being superior and making threats? You can show how to be humble and generous with his things though… Perhaps he can use that new truck to help some other kids nearby get to school if they don't have cars, or you can both volunteer at a shelter or for a community ride-share on the weekends and help someone less fortunate get to appointments or whatnot. Perhaps you could talk to him about finances, you could take a class in finances together and show through example the importance of having a budget, savings, giving to charity, etc. He's not going to be harmed by gifts so long as you and your ex aren't using these things to get at each other, which it sounds like that is what is going on--- she knows you don't like it, so she's doing it and you are making this about your son and giving him labels he doesn't deserve because you don't like it. You are going to do the best work teaching morals and integrity if you have some yourself.