If Bitcoin is a scam, I will sell the coins in my hand as soon as possible. I believe that anyone will do so, because no one wants to believe in a scam, unless very few people do it!
Many newbies don't understand but bitcoin is not a scam but there are many ponzi schemes which are based on bitcoin and they are a scam. We should avoid those scam investment plans.
Investing directly in bitcoin is never a scam, rather it could be the best investment ever.
things like this are usually done by people who net mostly beginners with the lure of very tempting profits. so that in the end they feel cheated and say that bitcoin is a scam, even though they themselves lack knowledge, this will be different if they learn about crypto