I mean in a substantial amount obviously. And what software does Amazon make? They use a variation of Android with a few changes for most of their produts. Samsung as well? What OS do they make? Google barely does anything on the hardware side as well.
If you look at Apple's revenue breakdown, their software and services revenue are negligble. They're basically a hardware company. Software and services are just complements they use to get you to buy their hardware. You can tell what business a company is really in by ignoring all the products they sell at a loss, below market value, or give away for free.
Apple sells all their software below market value and gives away iCloud for free but always maintains high margins on their devices - they're hardware.
Google gives away their software and services for free and sells the Nexus at a loss, but tries to monetize everything through advertising. They're an advertising company.
Amazon's tablets have a pitiful profit margin, act as gateways to their website and Kindle store, and the company feels threatened when Apple screws with eBook pricing - they're retail.
Samsung maintains a decent profit margin on their hardware, and even though they're working on Tizen, it's open-source. They're hardware.
Microsoft historically has had OEM's put out cheap hardware but maintains a high profit margin on software. They're software