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I got the similar messages few times and usually from unpopular betting sites with poor UI. Well, I always enjoy how they are trying to scam but I knew they obviously just want to scam so I don't follow their orders. They can do it themselves, if it's not a scam. Why bother to message unknown people, that's nonsense!
Similar to me. I have received offers and sudden winning of something which I did not remember I participated in. Sometimes through emails. I managed to reply some of their emails but as soon as they are asking for a payment or bringing in your btc address and other important information I automatically put them on ignore list. It's easy to spot scammers as long as you're greed level isn't very high.