Give the founders a break. They're probably first time founders who haven't figured out how to get customers yet. There was a time when I thought it was a good idea to email people and ask them to check out my product.

The results weren't great, but more importantly I learned my first lesson in sales/marketing. Don't ask for the sale in the first conversation. It completely turns the customer off. Instead build a high quality relationship with them. Ask them what their problems really are. You can figure out quickly if your product will solve it for them. When you establish enough trust they have a higher chance of buying from you.