I agree that this probably could have been phrased in a slightly less charged way, but the truth of the matter is that these companies have such a large market share that a small business can't really afford to ignore those platforms, as it gives them an opportunity to reach far more customers than they could under more general marketing approaches.
Whereas, larger companies may very well have the brand recognition to lean away from those platforms and comfortably absorb the lost potential business. It's that ability to survive that is being described as "privilege". Part of a pretty terrible linguistic shift around the idea of businesses as distinct individuals.
And as a final note, what you're zeroing in on is a quote from Rumman Chowdhury, so it's probably not Rose Eveleth's words (The Vox Reporter), though she did absolutely choose to include them.