I'm not a lawyer, but I think this actually has some interesting things to think about. Not all cookies require consent under the ePrivacy directive, there is an exception for cookies that are "strictly necessary for the delivery of a service requested by the user". I think that'd fit in this case, since providing a cheater free experience is part of the "service" the players are looking for. At the same time, the ePrivacy directive also mentions that the user should be provided with "clear and comprehensive information" about what is stored. Providing that would render the cookies useless.
I don't know how these would balance each other out legally, but it's fun to think about
They're regulated. Not German nor a lawyer but my understanding is that security cameras should only film private property (or as much as possible) and constantly running dashcams aren't allowed. It seems you're only allowed to record when something is happening but a dashcam which deletes the records unless you save them seem to be fair game