This is neat but totally leads to false "validation". This is slightly better than just getting an email. Product Market fit (or even Problem Market fit) is more than someone just imagining their future best self as being interested.

True validation has the prospect part with something of value, real value, not just an email.

Like, give me $100 and I'll tell you how I've boot strapped a company now worth $4MM. Or I'll tell you how my previous company took $50k investment and grew to be worth $60MM.

Only folks really interested in the problem space would part with something of value today for a solution tomorrow.