How many you made worse off, and how much you made them worse off is a function of how much you got ahead and in how much time.
"Free-market is not a zero sum game", is a lie that morons that go by the name of 'economists' like to tell you. The world economy is growing by a minuscule amount of 4% every year. Yes it's pretty much a zero-sum game, when some grow way more than 4%, and others less, or even grow negative.
When CD tech became widespread, the VCR industry went out of business. When DVD tech came along, CD industry went out of business. Online streaming put pretty much everyone else out of business.
Do you not call this making people worse off? I do.
Is it a bad thing? that's a different question.