Bezos says 'country in trouble' if big tech turns its back on the Pentagon
cnbc.com
cnbc.com
The answer is almost always no.
The Defense Federal Acquisition Regulation, along with executive orders and other lower level orders, places explicit limitations on the source of technologies that will be used in Defense.
The mundane result of modern tech companies not working with the DoD, or other federal agencies, is simply that the average serviceman or woman will continue to have to use terrible software and generally default to the "Microsoft Weapons System" (Powerpoint, Excel, Word, Sharepoint). You wouldn't believe some of the amazing Macros built by innovative Soldiers, Sailors, Airmen and Marines.
There are efforts to remedy this by building modern software natively by service members, but we're still in early days.