I don't think this is so black&white to the point where you can say people were wrong or right for not telling that James had problematic behaviors. I had a similar situation with one of my best friends at the beginning of the year and I always tried to understand her side and talk to her, give some signs to why she was being problematic but she dismissed me (and other friends who did the same) and kept going until she f*cked up with one of us, which was kinda the trigger for us to have this big fight which ended our friendship, it was the moment when shit hit the fan. And I feel like the same thing happened to Tati, she was trying to make him a better person because she cared for him and wanted to make him learn and grow instead of actually destroying his career. Also, I don't think it would be something that easy to do some time ago, JC had a big influence, so calling him out without having much proof wasn't going to be much effective. He was truly unlucky the Gage and the Sugar Bear situation happened basically at the same week.
I'm brazilian and I didn't even know about her... but she's just lazy with her cosplays, she never does anything complex and she even photoshops basic things like flannel shirts??? You can get those for real cheap here
I think her looks are a factor but her "I am so relatable and quirky" act is also a big part of her fame, she caters to thirsty teenagers and people who don't really mind thinking about what they're watching, Poki offers basic humor that doesn't require much