This is not making any sense.
Makes perfect sense. Give this new user your business idea and if it is liked, it is taken.
Ok, which ideas, unique ones or those with huge potential of profit? Or may I ask him to choose one from it?
OP Before negotiating with you, can you write what kind of projects won't be accepted from the very begining? (for example social media, streaming or etc).
Email adress sucks, looks very ugly. Can't think of serious offers but get ready for massive spam.
In such cases it's usually better to meet people on blockchaim, crypto and IT meetups, just consider.
