You can see the bot changed its name and profile pic to match the OP so it isn’t clear to casual Twitter users that the scam is from a different account.
These users are almost always hacked, there have been instances of public, verified people that were abused.
The problem is that Twitter's moderation teams are hopelessly overwhelmed, massively understaffed and, for the lack of better words, utterly incompetent/unable to understand cultural context - probably somewhere in India, Vietnam or wherever else you have a large number of cheap heads.
That's an interesting observation, I wonder how one could design a system to moderate a social app at scale? I've been thinking about this recently, but not sure what possible solutions could be. I was thinking there needs to be a way to incentivize the users to self-moderate in a way that is fair and works for most cases.