Then you decide to disassemble the charger just to see if there is a problem and this is what you see:
You get surprised when you find only three components, and you start thinking that small black component, with three legs can't be what you're thinking it is... but it is exactly what you think it is:
Joke or scam?
Fortunately, it could be worse.
Remember: Always check your cheap eBay charger before connecting them to your devices. Open it if necessary.