As for DMCA filings, we publish all of them here: https://github.com/github/dmca
I see two from Photopea, one from 2022 (https://github.com/github/dmca/blob/d97814f268e07e62aabe8b5c...) and one from 2024 (https://github.com/github/dmca/blob/d97814f268e07e62aabe8b5c...) - could you point to the recent filing?
I work at GH, but am not involved in DMCA filings, and can in no way answer or judge this case, but potentially follow up internally.