just because you throw a copyright notice and other rights reservation language on a website does not mean (a) the copyright is valid; or (b) it’s even enforceable.
As others have noted, copyrights, just like other IP, are jurisdictional and it depends on where the copyright is/are registered, where the potential copyright infringement activity might take place, and the laws of the respective jurisdictions.
assuming Amazon owns DPreview, we also don’t know if their ownership deal includes any potential DPreview IP, which may or may not even be owned by the corporation itself (assuming DPreview has IP assets)
for example, if the DPreview website was copied and put on a server located in an obscure country/location where DPreview/Amazon did not register a copyright for the material, they’re not going to be able to take that content down easily if at all and would not necessarily be violating any laws (especially if the server were located in an area that was not a Bern convention signatory).
also….copyrights require legal enforcement to stop others from infringing upon a copyright, which costs money. I have a hard time believing a corporation would shut down an arm it deemed not profitable, and then spend money without any monetary gain necessarily to protect any IP owned by the company it shut down because of lack of profitability, but, I am not business/economics expert
*not legal advice