Looks like they were AI created. If so, you may not have a copyright on them.
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Yeah, opening one of them in a hex editor gives it away:
Image Creator from Designerdwhent2025-03-13T20:56:52ZqdigitalsourcetypexFhttp://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMediakdescriptionrAI Generated Image