Samy Kamkar has a knack for subverting technology and finding the security holes within.
By default, Acorns wants to sniff your bank transactions to find out what you purchase in order to monetization this information in the name of ‘round-up savings’. Curtail this by not giving them your banking information and make manual deposits in your retirement plan.
Robin allows you to trade stocks for free. I wish this service was around when I was younger. Acorns is good for general savings. Robinhood is for when you have a specific company you’d like to invest in.