Right now, they don't have a "D&D Brand", they have a "Forgotten Realms D&D Brand". I'm curious as to how many things they have put out or have planned that are D&D-oriented...and NOT related to Forgotten Realms as a world or with regards to FR specific characters/names? ... So, is this whole "D&D as a Brand" a thing they are doing, or are they just trying to blow smoke up our keesters by claiming that, when in actuality they really are pushing for a "Forgotten Realms as a Brand" and hoping nobody will notice?
That's not how branding works-- WotC has nothing to do with it. With the exception of games that Hasbro themselves put out... anything else produced comes from the company itself who makes it, and they decide what images/branding identities they want to lease from WotC to use.
If a lunchbox company wants to make a 'D&D'-branded lunchbox... they would set up a contract with the brand department of Wizards and request and receive a whole bunch of images that they would pay a stipend to use. If the lunchbox ends up having Drizzt on it, that's a result of the lunchbox producer deciding that's the picture they wanted to put on it-- NOT that WotC forced them to use it.
The lunchbox company could have just as easily said they wanted to put the D&D ampersand on their lunchboxes. What do you think was going to happen then? The WotC branding department would tell them "Nope! Sorry! You either put Forgotten Realms imagery on the boxes or you get nothing!"? Of course not! They'd sell the company a whole heap of ampersand images because one D&D image is just as good as another.
If companies put out material that has Forgotten Realms stuff on it, it's because *that* company thought that was the imagery that would sell the best-- NOT that WotC didn't give them a choice in the matter.