People could trade at whatever hour they want, trying to trade on the most active period of the day or most active period of the week, or even most active period of the month, year will not really yield you any better or worse trades if you are not at the top of the game. Sure maybe there are very few traders who are so veteran and great at what they are doing that they end up with actually making a huge decision and change their trading according to time zone, but that is very rare and very few people.

Any regular human who makes regular trades should not care about it because the difference is just few pips and that should not matter to you unless you do 100x high risk leverage per minute. Of course there will be tons of people who will ignore this and keep on trying to find the best methods of trading instead of actually learning how to trade but that's okay, thanks to them we make a lot of profit.