A scam is not defined by whether or not a product developed is sold.
A scam is defined by whether or not an announced product is developed.
The developer has no control over the marketplace's acceptance or lack of acceptance of the product they have developed.
One Invests in a developing company, such as SMME, with the hope that the product being developed will reap rewards but the investment is first focused on developing the product itself.
I would guess there are a number of good products that sat on the shelf until their time arrived.
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