They are just like TCP/IP for a purchase from china, with buffering in the US, chunking, retransmit and guaranteed delivery.
You can probably be more efficient with UDP from china, but you could lose packets.
https://www.amazon.com/s?k=grip+strengthener&rh=n%3A14333021...
I will no longer use Amazon for anything where I actually care about quality or getting a legitimate product.
A few weeks ago I ordered the same USB charger a second time and got a different (but similar) item altogether.