Upvoted but disagree on behalf of Youtube, Android, Keyhole, etc.

Some exist independently, others are absorbed.

To be fair, Youtube could have been so much more. For example they recently removed the video response feature while claiming the click-through rate was abysmal - it probably was because the focus of Youtube is more like "Newtube". TV now means on demand and broadcast via internet/web, simple and boring as that.

Youtube would have died by itself.

Or imagine what Yahoo would have done to it post acquisition.

I know Apple would have called at iTube & put a price tag of $0.99 on all decent ones :)