You can't "close up" software that was free. The software remains free.
The only freedom the allegedly "more open" licenses give developers is to deny freedoms to their users.
It gives developers the freedom to create an aggregate product without also releasing their own code under the GPL, allowing them to pursue a business model that they feel will fund the ongoing R&D necessary to produce that product.
For the users (and software freedom is about them), those licenses give nothing.
If users do not feel that a product does not provide a fair trade, they are under no obligation to purchase or use it, and the original code remains to do with what they will. However, as indicated by vast market success, users do feel that these licenses and the products produced using them do provide something of value.