Hi @McDutchie, thank you for translating Challenge as well as several other Social-Tools (and many, many more MediaWiki extensions :-) into Dutch; it is much appreciated! 👍

This page on sports betting has some useful info, but I'm inclined to agree that this particular message, and maybe some others (like challengeuser-info-body for example) could use a bit of rewording to make them clearer to the reader as well as more general.
Challenge, like other social tools, originated at ArmchairGM, which was an American sports wiki aimed primarily (and dare I say, only) at an American audience. Since 2008, when social tools have been FOSS and especially as ArmchairGM is essentially gone and has been gone for over a decade, there's been a much greater focus on international compatibility.