Cloud Computing: How to estimate the market size for the cloud cost optimization product? - Quora
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Most market size estimates are utter guesses.
I agree. Then, the better question to ask is: Are these helpful to do fundraising?
Most important thing is distribution:
How will you find and keep customers?
Can you validate that process?
Validating the process "de-risks" the startup.
Sure, these are the key priorities.