Valid copyright or not, its too late 'cause everythings already "out there". Even if they shut down the rom sites (certain titles are already disappearing from them), there's always usenet binaries, file hosting sites, torrents, etc.
Kinda late to start jumping up and down now about stuff they didn't give a rat's --I'm attempting to get by the auto-censor and should be beaten after I re-read the rules-- about 20 years ago.....
Another thing is the arcade hardware is getting hard to keep running. I just spent a couple days going thru a load of Midway CCRS boardsets (Gorf, Wizard of Wor, etc.). The failures of the 3 custom chips that boardset is designed around was disturbing. 10 years ago when I was heavy into repairing all that kinda stuff, there was just the "custom data" chip that was the common fault. Now the address and I/O customs are going tits up as well. They were custom made hybrid digital/analog and not replaceable by anything off the shelf. So....once they're gone/dead, these boards will never run again. Same with Namco boards that used customs...
I did manage to repair enough of them to put together 2 Gorf sets and a WOW.