Interestingly, this rash of DMCA takedown requests is apparently related to the Garry's Mod DMCA strikes from a while back. Apparently, copyright protection companies have started using some kind of automated AI service to mass flag and DMCA hosters of infringing material. This is why it's all so haphazard and the emails full of spelling errors
People are also speculating that Apple allowing emulators on the App Store played a part in this. A big part of why Nintendo went after Yuzu was that they were spooked about Android emulation eating into their handheld business. Now hundreds of millions of people can easily access Nintendo games on non-Nintendo devices they already own. Apparently people on TikTok were making viral guides about how to download roms from places like Vimms which probably didn't help either