Journeyman: people who donated to get him out of a hole will start to ask questions.
If he is lucky, they will ask questions. That would mean that they still cared enough, and would give him a chance to respond and perhaps talk them into continuing their support.
The bigger concern is that they will leave (or are leaving) quietly. No questions, no explanations, no "why I left" videos. They simply disappear. That is usually a sign that they are not leaving out of any disenchantment with his behavior-- they just don't consider his channel worth supporting anymore. They're not getting enough from him to justify the monthly expense. And they may have already found other places to spend that money instead.
I think he is getting close to the point where the only patrons left will be the die-hards and the people who haven't yet realized that they're still sending him money each month.