They are profitable and hiring people. How could they possibly be bad for the economy?
If you produce resources or services of value, then the future is rosier because others will trade with you in exchange for access to those resources or services.
If you make some piece of software junk that's dismally easy to copy and do so based on speculative capital, particularly when it provides arguably zero unique value, then what you've done is wasted everyone's time... including that of your own workforce. See http://en.wikipedia.org/wiki/Evernote#Similar_products_and_s...
Unfortunately, this sort of thing is rife in the US.
Back to reality: I cannot conceive of China suddenly sending squillions of RMB to the US because someone figured out how to Web2.0 a TODO text file. Hence, skepticism on real economic value.
It's true enough, but that doesn't mean that your underlying premise is valid.