> And there are business models that could rely on GPL to make them viable (offer custom licensing for a fee for eg.)
This seems to be the most common GPL-based business model; particularly popular with Oracle, whose newest open-source/commercial license product (confusingly called Oracle NoSQL; it's more or less an autosharding network available BDB JE) is actually AGPL.
This seems to be the most common GPL-based business model; particularly popular with Oracle, whose newest open-source/commercial license product (confusingly called Oracle NoSQL; it's more or less an autosharding network available BDB JE) is actually AGPL.