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Blacklists are just a natural part of SG. For most of them you won't ever learn the reason, so just ignore them and live a happy life 😎

It could be any number of reasons to be honest. It could even be completely random. Everyone's free to blacklist whoever they like for whatever reasons (or lack of reasons) they may have. I've been blacklisted by a few, and I'm pretty certain they're for comments made in threads that people didn't agree with. It happens. Best thing to do is ignore it and not think about it. I don't really enter that many giveaways so it has little to no impact anyway :)

I, for example, mostly blacklist people who can't be bothered to say thanks after receiving a free game.