4 ideas
A succession of adults take an interest in him, and most of them want to profit from his music or use him in their own schemes. The book's episodes show a child whose talent keeps him alive while also making him easy to exploit.
A child who can earn money but cannot protect what he earns becomes a resource that adults compete to control. His gift draws crowds, and the crowds draw people who want a share. So the skill that should make him independent is the reason he gets captured.
To a dependent child, the adult who feeds and shelters him and the adult who is setting him up for use behave the same way at the start. Both offer food, company and praise. You can only tell them apart by what they eventually ask for, so a child who must accept help to survive cannot screen out predators in advance.
Because Akin cannot see faces, settings or actions, he has to judge adults almost entirely by their tone and their promises. Exploiters get the most leverage from exactly this gap between what is said and what is done. His blindness is a concrete, literal case of any person who must decide whom to trust with only other people's words to go on.