@lightweight For every mega corporation which “exploits” open-source software there are probably dozens of small companies for whom much of their software is entirely incidental to their business.
Last year (and probably next week) I had a medical scan which I'm most intrigued by (it seems indistinguishable from magic). A nice aspect was that after the technician had done the scan the results were on the consultant's computer in minutes. I'd be entirely happy if that was done with open-source software and would hate to have this sort of innovation tripped up by viral copyleft licences.
Personally, I'd never use GPL for any software I wrote though I could be persuaded to consider LGPL.