Basically it seems that StumbleUpon are saying that anything uploaded to their system becomes public domain.
The flickr and Yahoo! T&C are OK in that they only assume rights to display etc within the context within which it was uploaded.
Quote:
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With respect to Content you submit or make available for inclusion on publicly accessible areas of Yahoo! Groups, the license to use, distribute, reproduce, modify, adapt, publicly perform and publicly display such Content on the Service solely for the purposes of providing and promoting the specific Yahoo! Group to which such Content was submitted or made available. This license exists only for as long as you elect to continue to include such Content on the Service and will terminate at the time you remove or Yahoo! removes such Content from the Service.
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With respect to photos, graphics, audio or video you submit or make available for inclusion on publicly accessible areas of the Service other than Yahoo! Groups, the license to use, distribute, reproduce, modify, adapt, publicly perform and publicly display such Content on the Service solely for the purpose for which such Content was submitted or made available. This license exists only for as long as you elect to continue to include such Content on the Service and will terminate at the time you remove or Yahoo! removes such Content from the Service.
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Flickr are also pretty quick at stomping on other sites that abuse or don't respect copyright.