When a company is public there are short positions to be played and this is definitely 'value creating' - in the exact same manner that all financial activity is 'value creating' on some level.
It was not a 'bubble that burst' on WW, so much as it was a misunderstanding of the public's appetite for risk. There is a company there. WW is not being wiped out. Softbank may very well recover their 'losses' and then some.
It's a misunderstanding of the nature of risk and the need for some companies to take in 'fuel' that makes grasping what happened with WW a little more difficult. Also - because we love to hate on people that make 'koolaid that's just a bit to strong' - while at the same time adore those who make 'just strong enough' koolaid ... there's an element of populism going on here. Amazon's retail business has never made a dime - though there are obviously some powerful fundamentals there, it can't really be ignored, and yet, we keep Bezos very, very rich in terms of valuation.
My prediction is that in the long run, WW will be a succesfull company, it will make Softbank money, and that Newman's $1B take, in retrospect (if that's all he got) will seem on par with most startups that made it big. And I say this as someone who really doesn't like the guy, at least from what information there is publicly.