I feel the only place for a €1 cable is met by those USB-A to C cables that you get with things for 5V charging. That’s it. And it’s very obvious what the limits on those are by the A plug end.
Anything that wants to be USB-C on both ends should be fully compatible with a marked spec, not indistinguishable from a 5V junk wire or freely cherry picking what they feel like paying for.
Simply marking on the cable itself what generation it’s good for would be a nice start, but the real issue is the cherry picking. The generation numbers don’t cover a wire that does maximum everything except video. Or a proprietary setup that does power transfer in excess of spec(Dell, Raspberry Pi 5). But they all have the same ends and lack of demarcation, leading to the confusion.