Well, sure, you and I know that. This website is aimed at the novices however.
One of them will read through the website and get excited to give FOSS a try. He will put in the work, release the project only to see it getting reskinned and put up for sale. This will be as unexpected as it will be demoralizing. So this eventuality needs to disclosed upfront and not hid behind amorphous "commercial use" and misleading "a fee [...] for instance to cover the costs of bandwidth". Just be frank with those whom you are trying to convert, especially about the caveats.
One of them will read through the website and get excited to give FOSS a try. He will put in the work, release the project only to see it getting reskinned and put up for sale. This will be as unexpected as it will be demoralizing. So this eventuality needs to disclosed upfront and not hid behind amorphous "commercial use" and misleading "a fee [...] for instance to cover the costs of bandwidth". Just be frank with those whom you are trying to convert, especially about the caveats.