I just wonder that the action of taking photos or videos in Scandal’s show in Asian including Japan, is banned, but that’s totally fine in Europe/America?

Sorry if I make any mistake:)

Some bands ask the audience not to take pictures even in America/Europe (Perfume in America for example) but for the most part I think its just the culture around concerts, the insane amount of 4k Ultra HD fan cams that come from Korea/China concerts is just astonishing. They even go as far as to having a camera for each members of idol groups. Whereas in America you generally get your crappy 30 second videos. At least for SCANDAL, last US tour they didnt specify no pictures and enforced the venues policy, for example at A-cen (anime convention) pictures were not allowed but for any other venue that was House of blues pictures were allowed as that is House of blues policy, OK pictures and video but no professional cameras unless you have a press pass.

And if I may add, Asians are generally more susceptible to commit acts of piracy by selling the videos/pictures taken during shows than Europeans and Americans (which of course, depends on who you ask, has negative impact on official releases).
And some videos and pictures taken are somewhat... creepy.   .hmmm.

It's just a cultural difference in how they promote things. I can't really say anything about other parts of Asia but I've actually worked with various Japanese companies to promote various things (video games, clothing brands, and musical acts) and for the most part, they just want to have complete control over the process. Allowing people to take pics and video is giving up a large part of that control.

American and European companies have probably learned through experience (or possibly desperation) that even though it means losing control, having a lot of fan-made pics and videos out there ends up being a net benefit. What you lose in control, you make up for in extra word of mouth promotion, which also has the benefit of being free. But Japanese companies either haven't learned that or have learned the opposite lesson somehow. The culture in general is not as used to chaos as western cultures are, so my own theory is just that it's too difficult for them to give in to anarchy without knowing or being able to control what's going to happen.

It's completely possible that Scandal not imposing restrictions beyond the venue rules on the last US tour was either an experiment, or an acknowledgment of the different culture. No doubt they'd have been working with Sony Music Entertainment America on that tour and I've met a few of those guys and they're pretty open to letting the fans do what they want. But ultimately what they do in Japan or other parts of Asia is going to be up to Sony Music Japan and/or their management.