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I am afraid so. Once a user uploads the photos on such a site, the photos belong to the site. The website can keep them as long as they wish. Anything posted on a website belongs to the website, and sites like the ones you mention specifically make it clear that this is the case in their disclaimers.
That does not mean that the sites may not take the information off if asked. However, they do not have to do so unless they want to. It is at their discretion.
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