In fact, the people who complain about bitcoin being a scam are also the ones who accumulated loss on their investments due to their poor understanding and research on the market.
Before investing, one must ALWAYS consider all the factors and study the market in order to have a grasp on the current situation and from that standpoint, they can develop an extensive plan either for short/long term.
There are people who already knows the risks but still pushing their desire to somehow hit a passive income when they deposit their precious money in a sh*t company
We could summare this guide to just be caucious, learn because knowledge is best security you can get in Bitcoin world.
Most of the rich people did not get their wealth in an instant. They built their respective empire with their sheer determination, hard work, and patience which most people seem to disregard (although some got lucky). The problem is, they see bitcoin as an avenue to make a quick buck and disregarding all the risks involve without studying the market. Now, all of which resulted to their financial loss.