No, they’re obviously very good for you, I major on them and I now have to wear a belt to stop my joggers sliding down. Can’t understand why the weighbridge keeps registering an increase. I think it must be down to my vastly increasing number of brain cells to help with my sadly decreasing memory. 
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I worked out why the cables on ‘own label’ power tools were so much shorter than top brands’ cables. My idea of the right length for a power tool cable is to be able to reach to the top of a door without picking an extention reel off the floor.
One or two factories in China make the ‘own label’ power tools for dozens of ‘own brands’ and budget brands all over the world. 25cm-30m saved on the cable for a power tool, multiplied by 100,000’s, is kms of cable.
Then there’s the sub-standard parts, as billyb mentions.
It’s not the length that worries me about Chinese cables - it’s that they all too often lie about the conductor area and use copper coated steel or aluminium which has a much higher resistance (and therefore lower safe current) than pure copper.
Plus they do this:
Go cordless (with decent brands - Makita, Milwaukee, Hitachi). After a catastrophic angle grinder dailure, I can’t ever trust cheap store brand power tools again😬