The user is naive. That's all.
Also, it's better to have SimpleX for support, where users can't send messages to each other.
Or just a separate SimpleX account for support.
Discussion
Stop blaming the victim
Why?
That's what organize crime wants. Then nobody ever does anything against them.
It's the guy's own fault for not knowing how to use Telegram. That's why the scammers made money off him.
And if we analyze it more deeply, because of this person, the scammers were once again convinced that their business is profitable, and they will continue to operate. And all because this guy couldn't protect himself.