If you don't have permission to use copyright-protected work, your content could still be removed even if:
When giving permission to use their work, some copyright holders ask that you do this. In some cases, you may also need to credit the copyright holder if you plan to use their work in a way that you consider fair use or fair dealing. However, this doesn't automatically give you the right to use the content without permission.
Owning a copy means you might be able to sell that copy or give it to a friend, but it doesn't give you the right to publicly share that content with the entire internet.
While it's more likely that non-commercial use can be considered fair use, or might satisfy the requirements of some licenses, not making a profit alone doesn’t always mean your use is non-infringing.
Those other users might have gotten permission to share the content, or they may be using the content in a way that can be considered fair use.
Making your own copy from one of these sources doesn't give you the rights to the underlying content.
As with the above, making your own copy doesn't give you the rights to the underlying content.