Someone buys a handgun from a gangbanger then runs around shooting it in the street and gets hurt as a result. He cannot sue because the purchase was illegal therefore nothing is binding.
The players cannot sue unless they exchange cash for a fill, h-pac and ms are exempt from liability due to 3rd party contract law, the player being the 3rd party has no legal right to sue for damages. Players would also find it difficult to sue under tort law as the MS has made them aware of their bottle being illegal for use, by ignoring this notice and using a dot bottle anyway they are disclaiming much of the responsibilities of the other parties. This is particularly arguable if all players are made aware of this when/before paying/signing entrance fees.
Sorry I have to study this kinda crap
If it is illegal to fill a dot tank however then h-pac could get into trouble with the relevant government prosecution service, unless they have special allowance (permit of some sort) but this is unlikely unless there is a serious accident in the wrong place. Even then they may not be liable, the circumstances of the event decide how much the law can be twisted, sorry I mean manipulated....no wait I mean interpreted
Either way, someone is more likely to get hurt by using an out of date beaten up bottle than a perfect condition, in-date, DOT bottle... It really is pencil pushing bullsh!t!!