I don't think cooler/trendier is the reason major companies with established long-term offices use WeWork. I spent a few months in a WeWork office - which was more uncomfortable than it was cool or trendy - as an employee of such a company and the reason was mundane: needing temporary space for a subset of the workforce during an office remodel. I'd wager for most big name clients the draw is the short-term/low-commitment nature of the offering rather than cooler trendiness of Class C office space that's been tarted up with a thin layer of Silicon Valley chic.

Well, other companies provide short term rentals. It's probably more the investor subsidized pricing.