It makes more sense to tell the community what the project is really about than asking people to contact you in private just to find out more about it. By sharing the basics, you will at least get rid of DMs asking for more information and wasting both your time and theirs if they find out it's not something they want to participate in.
He's here only to get money from the people who will DM him about the project. I don't know why everyone thinks that they will just come up with NO idea and people will start believing in them and also start to invest in the project that has no value and hasn't even started.
Every now and then, the newbies try their luck here on project development section and hardly we find any sensible project here except people begging to invest in their scam business ideas. I am sure he will ask for money, I wonder if anyone has DM him 🤔, that may proof of what is says there in private.