Yes it is.
Generalizing something as a "scam" without any sort of facts to back up that claim is plain and simple misinformation. If OP did, for example, say that they're referring to the US specifically and that the issue isn't really the recycling part, but the corruption part, I'd be completely fine with their claim. The way it's written right now is misleading at best, and straight up false at worst.
Also, no, it's not just Germany.
No, I don‘t think it is.
Not everything that isn‘t working perfectly is automatically a scam. There are many factors that might prevent a relatively large amount of trash from being recycled, like, for example, contamination with other substances or additives, unseparated composite materials or simply technical limitations.
That‘s not a scam, though, that‘s just the current state of the available technology.
Here in Germany, it‘s pretty common knowledge that these limitations exist. Recycling is still very common, as ~40% is still far better than 0%.