That tends to happen.
I often wonder what enables people to leave such scathing reviews of someone else's work. Reviewers like you had nothing to do with the production or promotion of videos and often don't pay anything to watch them. If a user feels a channel is going awry, they have no resistance to belittling the creator and doing so with a total lack of empathy.
Sure the anonymity is a huge factor that doesn't make someone care enough to write about it. It's as if you felt a sense of ownership in Cody'sLab and he let you down when he began to display the negative affects of his real live in the videos he created.
Your feeling of ownership over something you have done nothing to earn is entitlement. YT creators are just people and they don't get paid a lot. They are constantly chasing an algorithm created within a labyrinth for which they have they have no control over. They feel they need to create and post weekly or they will be penalized. Once they achieve Internet influencer status they find it is a very lonely depressing place to be and everyone watching has demands yet provides no money and no help to create. It's frankly disgusting to see people behave this way.
https://www.youtube.com/watch?v=x1mv0vwb08Y
In this video Cody'sLab clearly spells out that he's going through a hard time in his life. He's allowed to be human. If you don't like it just move on and shut your mouth. Have some dignity and allow others around you to reclaim or maintain their dignity and self-respect.