When signing up, it would probably be ideal if you could create some legal agreement when it comes the use of the person's IP address and if you're using anything else such as hardware ID. You can have a privacy policy, but that normally comes into force when the user agrees, there's no real prompt/checkbox/closure for it. You could essentially sign-up without agreeing to use your IP Address, but you'd use it anyways.
I'm also unsure what this means:
§ 2 Processed Data from website
(2) When you use Warband Matchmaking your IP address is logged by our server, which is a number that is automatically assigned to your computer
Are you saying the IP-Address is assigned to a number like a HashMap/HashSet and then that index is assigned to an account? Or are you saying that your IP Address from the start was assigned to your computer even when it's more than likely to be dynamic? Since it's very obvious IP Addresses have nothing to do with your computer; the IP Address can however, allow you to possibly identify someone which comes to the first part of your policy:
§ 1 General Info
To better protect your privacy we provide this notice explaining our online information practices and the choices you can make about the way your information is collected and used on the WarbandMatchmaking website. This website does not store any information that would, on its own, allow us to identify individual users of this service without their permission.
You've created a policy but that's not anyone agreeing to its terms, there's no legal agreement, thus means you're using information without people's permission, your policy means nothing if there's no terms to agree with. With that in mind, you're saying the website stores IP Address yet are saying it doesn't store information about individual users 'without their permission'. I just need clarification because the policy seems contradictory unless the IP Addresses are encrypted, but if that's the case they'd pretty much be useless to use.
§ 1 General Info
'This website does not store any information that would, on its own, allow us to identify individual users of this service without their permission.'
This part of the policy is very poorly worded, makes people assume that what's stored can't identify them. The correct wording would be something like 'The website does store information that could potentially identify a user, however, this information is stored and protected when the user legally agrees with the policy.'
I guess I also suggest (even though not legally obliged) to create T&Cs for like donations, behaviour, accountability etc.
As for the web betting system, don't put your guide in the rules and regulations page xd