For all you folks saying that big Clint needs to do an intervention or intervene... He has on several occasions and it has not changed a goddamn thing. Debit card gone, remember the video on a Monday or Sunday where Josh said he was going to stop making videos and focus on him? And then not 6 hours later he was drunk on stream again? That was after Clint gave him a piece of his of his mind on the phone. A clintervention won't do anything. What will do something is Clint ignorance. When this new apartment comes up for lease if it gets an inspection or they tally the points for noise complaints and other nonsense, if Clint doesn't help with the third apartment that's when we'll see a change. Josh has never had to truly fend for himself out in the world and it would be very interesting if he tried to navigate getting his own house or apartment.
TL;DR: The Clinterventions would work if Clint wasn't such a shitty parent.
If you watch Josh for long enough and follow his life, there are some observations that you can make that explain this situation pretty well and explain why these Clinterventions aren't functional.
The debit card is a good example, actually. Clint has the foreknowledge that Josh, his mentally deficient son, is terrible with money, as he's always handled his taxes for that singular reason. Why would you give someone this incompetent with money their own bank account and card, where you have very little to no control over? Josh proceeds to do what anyone with an incompetency in fiscal management does; Put his account into the negatives multiple times with no regard for the consequences. It's only when Clint is inconvenienced, having to field calls from the bank and having to pay the overdraft fees, that he steps in to remove the card from Josh. It's ineffective as a solution though, because it's already too late. Josh has his card details saved online and he can simply walk down to the bank and withdraw whatever he wants without his card because they know him.
These interventions into Josh's life
could be successful and beneficial to his situation, but they aren't because Clint doesn't do anything about the problem until it's too late and/or it inconveniences him. This situation, like many of Josh's situations, could have very easily been predicted and avoided. Any reasonable parent of a vulnerable adult would have fought to acquire power of attorney and opened up a joint bank account to make sure their child is well taken care of and watched for in case they decide to....I dunno, purchase fuckin' Nugenix scams on the internet...or they can pay their bills on time so they aren't out on the street...or they don't spend it all on destructive cycles of alcohol abuse.
Clint is not dissimilar from his son in some ways. Josh is like this, too. He will not do anything about a problem unless it's too late or it inconveniences him enough. He'll then do the bare minimum to rectify the symptom and go back to pretending that the root cause doesn't exist. The alcoholism is a good example of that as well, Clint could try a number of things to nudge Josh onto the path of recovery. He could organize an intervention with family and friends, as an example. That may not work, but the effort shows that he cares enough to try to help his son. What does he do? He calls Josh and politely asks if he needs help and counseling, knowing who his son is. He, like Josh, provides a shitty half-assed solution to a problem that's too far gone and completely avoidable and only because he was inconvenienced, not because he cares and he wants to avoid the situation altogether.