Bitcoin and their blockchain just new technology and need more inovation to make it better, this technology still has advantages and disadvantages, and this is normal for young technology. And this mean BTC is not scam, BTC is pioner of blockchain technology and this tech will keep in development and also give more benefits to the many industry and many people around the world.
In my own opinion, bitcoins is not a scam but there are people who are losing their coins because they are investing without a decent knowledge about how the volatility of the market works.