5. INTERRUPTION TO THE SERVICE
From time to time, in order to provide our customers with the optimal gaming experience, it is necessary for Square Enix to conduct routine maintenance on the computers and/or servers that support the Game. During these times, access to the Game or support services may be interrupted. Access may also be temporarily suspended in whole or in part, without notice, due to emergency repairs, fire, flood, explosion, war, strike, embargo, governmental action or failure to act, the act of any civil or military authority, act of God, or by any other causes beyond Square Enix's control, or any other reasons for which Square Enix, in its sole discretion, deems that temporary suspension is necessary. You acknowledge that disruptions of service may occur and waive any causes of action against Square Enix in any way arising from or related to any such disruptions of service.
Not white knighting at all, but wanting to point out with how this is worded, it basically allows them to not owe compensation.

Also, even if they were to put everything down for maintenance, everyone would still complain.

We technically aren't owed anything for early access, as it states it's a pre-order bonus. So, towards any SB content that you're unable to progress through currently... Not owed any money or anything as this is not time you paid extra for. It's a bonus, anyone buying after the 20th is going to be paying the same amount you did.

Having been through all the pre-order early access launches, trust me, you're not going to get anything for this. You can ask, but chances are, it's not going to happen.