mining btc on web is not safe or not trustworthy based on my experience on it . Cause they show some false video and testimonials . I suggest to stay away on it cause its a totally wasting time. Like some btc miners when you trying to withdarw the balance on it it will shows some paying stuff before you can get your earnings.dont easily fall on that kind of false and don't assume also cause its a scam. So mining btc is not recommended.