> Commit to something?

Yes, with an actual payment (processed credit card transaction), a signed contract with clear payment terms, or a convincing promise to pay such as a written instruction to send an invoice.

A lot of startups have made the mistake of thinking "customers" are the same as "downloads of a free app" or "people who created an online account" or "people who signed up to be notified of the actual launch."

Accelerators once encouraged this ("you have to show progress to investors on demo day!") but unless you have actual paying customers it's not a real business.