@leocg I believe there could be a few fixes for this on the Opera side. Someone mentioned earlier in this thread that google is most likely flagging the IP that Opera is routing VPN traffic through from various users. I agree with this sentiment, and I believe that the regions that get more traffic are more likely to be flagged by the google anti-bot algo. It seems like there are too few IPs being used relative to the amount of VPN traffic that is routed through the Opera server instances.
Maybe consider implementing an auto scaling policy which would spin up VPN instances when users connect, and take down unused instances when users disconnect. You might be able to some interesting network routing as well to help work around the google restrictions.