A search engine can only search for the content which is available online. A search engine can, however, not grant any licenses or guarantee that images are free to use. Therefore, it is your responsibility to check whether or not the image is free to use or whether you need to purchase a lisence. If you do not check beforehand and do not purchase the required license, you are of course responsible for any copyright infringement resulting from the usage of the image.
I copied the image from a search engine. Why am I responsible?
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