You cannot redistribute them period, for any reason, commercial or not. You ( the end user) do not own them, you cannot do with them as you please or even share them (e.g, 'redistribution'), and (you the end user) cannot even use them yourself on your system/Pi/hardware after 10 years, (at which time you are no longer covered under the use license, and you must remove them if they are installed).
If you violate the use/licensing terms, you can be sued for significant damages. You indemnify the rights holder/owner/representative agent/authorized third party against any and all claims (in otherwords, if you get sued for unauthorized use of the images, you cannot counter-sue for monetary loss, attorney's fees, defamation, etc).
The photographer grants the Licensee the non-exclusive, non-transferable and non-
assignable use of all images named above for 10 years, for the purpose of use as the
default wallpaper included within the Raspbian operating system, distributed by the
Raspberry Pi Foundation. The licence is “digital only” and for medium resolution
(long edge at 1920px), images shall not be used in any other form (such as in print
publications) nor for any commercial activities. However, use of the images to promote
the operating system and the activities of the Foundation (such as on social media, on
blogs and printed at trade shows) is acceptable.
The photographer retains all copyrights attached to the images as well as any other
rights which may not be detailed in this agreement.
Selling and/or redistribution of the images is forbidden.
Licensee is allowed to crop and/or electronically alter images to suit their purposes
for the usage stated above.
The Licensee indemnifies and holds harmless Greg Annandale against all claims,
liability, damages, costs and expenses stemming from a breach of this agreement,
the use of the images, your failure to abide by any restriction regarding the use
of an image, or any claim by a third party related to the use of the images.