It was on the website dude. I don't know about Robocop, because I didn't order it, but when I went to order Ryu I checked the pre-order page and down the bottom it said in red writing that 'orders before 3pm are subject to being cancelled'. That's where I got that bit of info, I didn't get it from a forum. It was my first time ordering from PCS, and I simply followed the rules that were stated on the website. I actually saw the order go live early, but waited until 3pm to make the order.
I'm not really sure why the orders always go up around 2-3 minutes early, but I do understand the policy of cancelling orders. If there are only 150 pieces for an item, and 100 people order before the official start time of 3pm whilst everyone else patiently waits for the clock to hit 3pm, then that means 100 people will miss out on the chance to get one because they followed the rules and others didn't. At the same time, I do get where you're coming from, and I think to avoid any issues, confusion and disappointment, they should simply make the PO go live after 3pm, and not before.