5 years, all participate and over the years never won, even the minimum amount ((((I think so, it's all scam !!!!
You obviously have no idea of probabilities then. The lottery hasn't been running for 5 years either. There are 154 rounds so far and only ten winners each week with hundreds of millions of tickets.
That's right, the probability of winning is very low, as in any other lottery btw, so it doesn't mean they are a scam if someone can't win for a long period of time. There are from 300,000,000 to 600,000,000 tickets sold for every round, so even with 1 million tickets your chances of winning are still low. Nevertheless, there's still a chance, always. In the last round, for example, a user won 0.02043172 BTC with just 124 tickets. Seeing that, I bought 200 tickets, just in case, and although my win chance is 0.00042143% I'm not losing my hope.