I think two legal principles apply.
The first was memorably summed up by Graham Roberts- "Football is a game of skill, but you get kicked". By agreeing to play you accept that injuries are possible.
The second is that the law ignores trivia- ie that the rules of the football authorities will generally apply in disputes, and anyone challenging this would need to demonstrate a crime/ negligence or whatever.
The adverts are certainly in poor taste.
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