“Not charging” display seems to be a common feature of 3rd party cables. I have heard it rumoured that it is a result of Apple ‘chipping’ their own cables, thus mandating their use. In my own experience, it seems more likely attributed to inadequate conductor cross section. A hefty current has to flow, which can result in a significant voltage drop over a metre or two. The only long (2 metre) genuine Apple cable that I own is significantly thicker than the 3rd party ones that display “not charging”. The genuine 2m cable overall diameter is noticeably stouter compared to the standard Apple 1m cables, approx 3.1mm vs 2.8mm on my micrometer. It did cost a whopping £25, mind you.
My own experience of Apple charging cables has not actually been bad. We have a bank of four power bricks in regular use, serving 2 iPhones and up to 4 iPads on a typical day. Some take quite a pounding - like the one on my desk used for debugging interface, constantly disconnected/reconnected, to different devices. Yet in 6 years, just one has actually stopped working. An apple USB keyboard cable also split open, but that was because I got it trapped under the stand of a heavy monitor.
If I had a gripe, it would be that ALL charging cables should be at least 2m, even if that means they are thick and ugly (like myself?). That would not just apply to Apple of course. Anything less than 2m is asking for trouble imo, as the cable ends up being stretched and strained during use.
Anyway, good luck with these Anker cables. They certainly look good value and seem to get good reviews.