How can it be a scam? A scam means that the devs plan on taking off with the money or that the entire project is just air. It's clearly a real project. Perhaps there's doubt, legitimate or not, about whether they can deliver 100% on their plans. But that's pretty far away from it being a scam.
If they say they have a solution for anonymous staking and they don't, it's a scam.
By using your logic, if you say that they don't have a solution but they do, you are a scam!
Do you have the proof that they don't have a solution? If not, you shouldn't be accusing anyone. Everybody can make their own choice whether to believe them or not.
The fact that that they don't have any of the premined coins as they took over this project and only rely on donations from staking already distinguishes the project from aĺl the other scam going on here. If they wanted to cheat, they could.have created a new ICO, take the profit and run.
The dev said he won't explain how anonymous staking is supposed to work, so yeah, that's all the proof I need--this looks like another scam.