When classifying scam, I don't think bitcoin is a scam rather it's a lack of understanding or reading broadly to get the required knowledge. Altcoin most times have the ability to swipe investors investment due to the trust and reliability they may seems to have on that coin, maybe people are being scammed today because they are looking for a fast yielding investment that could likely give double of their investment by making the wrong choice of choosing altcoin instead of the mother coin being bitcoin.