I think people were saying that because he was dealing with mental and physical issues and Jada was supposed to be his friend and support
I get that and if she had some kind of history of taking advantage of others I'd agree. I'd even agree that it's possible it could have been about the power dynamic of the relationship. That being said, August was seemingly a willing participant and I don't believe he views himself as a victim.
It's not unusual for romantic relationships to start out as something else. Do we even know exactly when they started a romantic relationship and if he was still dependent at that time? If you meet someone who was an alcoholic and you helped them recover, would you consider yourself a predator for later dating them? Dating patients is considered unethical during treatment for medical professionals. However, and I could be wrong it's not an issue after the person is no longer a patient. Jada only played a nurse or doctor. She was under no obligation not to explore a relationship.
Dating her friends son is wild, but that's a separate issue between her and her son. It's mainly just weird which isn't unusual for their family. But again, he was grown. She didn't take advantage of a minor spending the night for a sleep over.