Copyright infringement.

I found a profile where my work is copied, where can I complain about copyright infringement?

By @Fomina

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Is it an Adobe Stock Contributor or a Vendor?

Remember that Adobe partners with outside vendors who help you reach a wider audience of potential customers.  When you work with Adobe Stock, you enter a partnership agreement that allows them to promote and license your content from various websites while you maintain asset ownership.  You get paid when they get paid.