Actually, Flickr’s TOS (now a general Yahoo one) is quite different. They make it clear that their rights are limited to the specific uses obvious and essential to the function of their sites:
> Yahoo! does not claim ownership of Content you submit or make available for inclusion on the Yahoo! Services. However, with respect to Content you submit or make available for inclusion on publicly accessible areas of the Yahoo! Services, you grant Yahoo! the following worldwide, royalty-free and non-exclusive license(s), as applicable:
> With respect to photos, graphics, audio or video you submit or make available for inclusion on publicly accessible areas of the Yahoo! Services other than Yahoo! Groups, the license to use, distribute, reproduce, modify, adapt, publicly perform and publicly display such Content on the Yahoo! Services 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 Yahoo! Services and will terminate at the time you remove or Yahoo! removes such Content from the Yahoo! Services.
The key here is “solely for the purpose for which such Content was submitted or made available.” Pinterest’s ToS doesn’t have such language.
Additionally, Yahoo’s ToS doesn’t indemnify Yahoo against all possible liability or force their legal bills w/r/t copyright claims &c. onto users. The relevant language is much more constrained:
> You agree that Yahoo! has no responsibility or liability for the deletion or failure to store any messages and other communications or other Content maintained or transmitted by the Yahoo! Services. You acknowledge that Yahoo! reserves the right to log off accounts that are inactive for an extended period of time.
Although Yahoo is definitely more constrained then Pinterest in terms of their license language, they actually do have a similar indemnity clause:
"You agree to indemnify and hold Yahoo! and its subsidiaries, affiliates, officers, agents, employees, partners and licensors harmless from any claim or demand, including reasonable attorneys' fees, made by any third party due to or arising out of Content you submit, post, transmit, modify or otherwise make available through the Yahoo! Services, your use of the Yahoo! Services, your connection to the Yahoo! Services, your violation of the TOS, or your violation of any rights of another."
> Yahoo! does not claim ownership of Content you submit or make available for inclusion on the Yahoo! Services. However, with respect to Content you submit or make available for inclusion on publicly accessible areas of the Yahoo! Services, you grant Yahoo! the following worldwide, royalty-free and non-exclusive license(s), as applicable:
> With respect to photos, graphics, audio or video you submit or make available for inclusion on publicly accessible areas of the Yahoo! Services other than Yahoo! Groups, the license to use, distribute, reproduce, modify, adapt, publicly perform and publicly display such Content on the Yahoo! Services 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 Yahoo! Services and will terminate at the time you remove or Yahoo! removes such Content from the Yahoo! Services.
The key here is “solely for the purpose for which such Content was submitted or made available.” Pinterest’s ToS doesn’t have such language.
Additionally, Yahoo’s ToS doesn’t indemnify Yahoo against all possible liability or force their legal bills w/r/t copyright claims &c. onto users. The relevant language is much more constrained:
> You agree that Yahoo! has no responsibility or liability for the deletion or failure to store any messages and other communications or other Content maintained or transmitted by the Yahoo! Services. You acknowledge that Yahoo! reserves the right to log off accounts that are inactive for an extended period of time.