You forgot to mention investing crytpo into scam sites, the way I lost most of my online earnings at the start...
Can't really lose much if you never put in a penny from your pocket, still hurts knowing those 0.7 BTC I claimed from faucets and won in poker freerolls could be worth thousands today, yet I invested them into Mytrafficvalue black hole...
Guess we only learn from our own mistakes, I have made couple grand since staying away from scams...