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The problem with permanently banning dedis is that a lot of people would just ban every server that they get beaten on, whether there was genuinely an issue on that server or not. They would end up with problems finding games after a while and then they'll start saying "it takes ages to get games with Netduma" or "can't get any games with Netduma".
You might not do this yourself but plenty of people would and it would quickly cause an admin problem here.
Also, a server might suffer issues on one day that are resolved the next day.
If you really want to avoid a bank of dedis you need to drop your geo with them out-of-range.