The situation in China is improving with respect to intellectual property rights. Lego for example recently had a victory against copycats based on reputation alone (i.e. no registered rights involved). We also don't know what the OP has actually disclosed. It is one thing to say "I've developed a self-charging ebike are you interested?", it is another to completely disclose how the thing works.
Well as you say, we don't know what he has disclosed, the OP has posted then vanished. But if he has only revealed the kind of information that he has in this thread, I am not surprised manufacturers haven't got back to him. They must receive this sort of thing all the time and place it securely in the circular file.
However, I would say the average inventor is not going to have the legal clout and resources to tackle IP infringement as a massive company like Lego.
Why are people here so sceptical, you might ask?
For one thing, the OP is suggesting a potential solution to a problem that isn't really an issue. E-bike power requirements are small and modern batteries are amazing and getting better year on year.
Even those who have mobility issues (myself included at times) are generally not suffering from range anxiety. You just need to make sure your battery is large enough to suit your needs.
Ok, say the invention increases motor/transmission efficiency. These are already quite good. Perhaps you could improve things by 10%...so you increase range from 40 to 44 miles? And for how much cost? Then for a manufacturer, this may mean a lot of re-tooling. Plus there may be vested interests, if you make the system more efficient, you sell fewer or smaller batteries...
Alternatively, it could be an invention that somehow produces energy in a useful form as you go. People have seen lots of "perpetual motion" type concepts, which are just a waste of time. If you are going to produce electrical energy from somewhere, where is it going to come from?
You could run a petrol generator for one thing...but this has issues and you can't do this to charge a battery connected to your motor. You have to have two batteries and probably have to tow a trailer. So it all gets very heavy. And, it's polluting.
People have tried solar panels, but to gather enough power, they have to be comparatively large and be directed towards the sun...it all becomes impractical for everyday use.
I don't want to put off anyone from inventing and innovating, but, unless the OP can give more detail, it's unlikely anyone here will take it seriously.