Thanks for a brilliant response.

I suspect you are right about the copyright issues for uploaded photos. Ultimately it is up to the poster to ensure that they have the appropriate permission to use images - for this tag the guidelines are very clear and if they submit images they don't own then they are responsible for breaking the law not the people who might use them afterwards.

Although it could be integrated with a particular host that is not absolutely necessary and I think people should have a choice of hosts which they can use.