If your idea is indeed great, build the product then scale or sell it later. You cannot peg an IP right to a mere mental fart in PowerPoint slides without anything tangible to back it.
I've been following this and it's like someone approaching a landlord with an idea to repaint an apartment interior so as to attract high value tenants. Months later, they renovate their apartment then you say your idea was stolen. Why can't you just build your own apartment?