Brokerages could commission vendors to produce specific items in order to ensure that their range is broad enough. Vendors should not be forced. Just my opinion.

Forced is probably a poor word choice. But I'm thinking like they only allow so many vendors to make one type of content.  For example say you're making stuff for V4, then you're not allowed to make stuff for M4. And vice versa. But you do get a choice in what type of content you make.