Not uncommon in cheap devices

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Sure it wasn't a heatsink?

Unecessary big heatsink, plus unnecessary thick and appears to have been glued to the case

Some cheap chargers can get very hot, I'll take bigger and thicker if it expected to get hot when used properly.

I bet you would😉😁

Might have been a cheap knockoff, it's really risky using it with your device. Where did you buy this anyway?

Sometimes they also do this so your device doesn't move. It's not the same, but I have a docking station for my laptop that contains a 1 lb chunk of steel so it won't drift across my table.

If it’s a wireless charging pad it’s likely there to keep the pod from moving about. If it’s a docking style charging stand, it’s likely a counterweight for the phone.

Edit: Actually that looks like a wall plug. Not sure what it’s for if so.

They do the same thing in tv remotes, even placing them in an area that makes the remote orient itself correctly in the hand. Think heavy side down. If it has heft, it feels right, according to some.

They used to do this with cell phones for the US market because if it was too light it felt “cheap” or “low quality”. The same phones sold in the Asian market were a few ounces lighter.

It’s a heat sink and also adds mass.