All targeted pages remain taken down. It is either a three-strike rule in favor of the complainant or a bug in the reporting system, but counter-notices no longer have any effect. I'm only getting the 'We have already responded to..' messages. (Restored 2-3 times quickly, then brick wall).
Methodology: The attacker sets up sites impersonating the casino, with a different one for each geo. (Like geo-casino). After that, it automatically targets pages with specific branded keywords with DMCA takedowns. I have seen examples where 50 out of 70 results were taken down, with the attacker's site dominating the remaining results. In some cases, the said site redirects directly to the casino.
I don't see Google fixing the counter-notices, so I thought I should bring this up with my AM. In this case, it should be clear who benefits. Perhaps they can incentivize those partners not to do this. Even if I rename those pages, they may just get taken down again if those keywords are continuously targeted.
If you see your casinos being targeted in this way, flag it with your AM. I left a message on the 13th, and a reminder. So far, they have left me on 'seen'.