That is true. We learn from what we risk. Some mistakes are already done. Better stand up again and gain the lost. Some stops after being scammed but some grows because of their mistakes they are more experienced now.
Well people still get scammed even they are legendary of they know bitcoin very good or they start bitcoin in year 2013 they still get scammed.
Like in black friday people was using there signature cmapaign and none got paid so that is just sad if you don't get paid, but true you can learn your mistakes.
because they are in urge to acquire new bitcoin no matter in what way, in the future bitcoin will be very hard to acquire, so it's better to try every method now, even if it is risky
personally i'm not falling anymore at those ponzi and hyip and shit like that, i ignore all of them now, actually i'm ignoring every form of investment, because they are like 99%99 scam