My worst decision was investing into cloud mining by 2013 in CEX site. I lost around 0.01 BTC, then they were very big amount for me because I were earning from faucets only that at the times.
The ultimate targets of this sites are newbies, as they are well aware that its very easy to attract fresh users of bitcoins and I think this thread will be really helpful to newbies to avoid losses.
i remember when i was a newbie everyone told me to never gamble my money and i still did that a lot because i thought that one day it can make me a really rich person, however it was far away from what the truth was, as i lost some money
besides that it wasnt my worst decision to gamble my money, i think that the way worse thing is to put your money into ponzies and people should never do that in order not to promote the scams and make people lose even more money what would be terrible