No need for them to chase the next big platform like reddit/facebook/google+, and no need to create "official accounts" on each.

I see that DJI has a sub on reddit for example, but you need to register an account on reddit to post there. With the fediverse, you as a customer need only one account and you could access the instance of multiple companies. DJI could run its own instance, make their rules, federate whoever they want, (will probably allow respectable instances only, like what kbin aspires to be) and that's it, they don't have to adapt to the changing rules of reddit, of twitter, of facebook. They have one point for publishing, with full control over it, with video, firmware downloads, tech support, etc.

It's so much easier for them. A perfect neutral territory, no weird jurisdiction, no worries of being muted by a Trump for example who would impose a boycott like he did on Huawei.