Oh, these are endless quotes! It's hard to read.
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Advertising makes sense when there is something to offer, not just promises. In this case, marketing will be helpful and the project product may be in demand.
There is sense in advertising only when there is a ready product and develop ecosystem. It must be simple and comfortable to work with the product to new users.
How to find out about a product? Advertising is a way to attract attention and develop a community, not everyone has a finished product and this does not stop them from developing and fulfilling promises.