All scripts, add-ons, and other code-based products may be licensed as either GPL or MIT. No other licensing options are currently permitted for code-based products.
Assets don't have to be free the same way code is, so there are mostly royalty-free products when it comes to assets.
It is true however, many addons charge more money for a "studio license". I've been confused about it too and I assume it wouldn't be enforcable with a GPL license. I don't mind it too much though as I think it fair to charge companies that generate more revenue a bit more than individuals
GPL or MIT is mandatory for any code-based product on the Blender Market.
Assets don't have to be free the same way code is, so there are mostly royalty-free products when it comes to assets.
It is true however, many addons charge more money for a "studio license". I've been confused about it too and I assume it wouldn't be enforcable with a GPL license. I don't mind it too much though as I think it fair to charge companies that generate more revenue a bit more than individuals