> If you moved your money to Vanguard and invested in the same funds Betterment currently invests in for you, and you rebalanced as often as necessary, you would get a slightly higher ROI at Vanguard because Vanguard has lower fees.

Just felt like pointing out that you'd have to rebalance the same way Betterment does, which isn't the way I believe normal people do it. Betterment uses portfolio optimization techniques that can be hard to implement yourself: https://www.betterment.com/resources/investment-strategy/por...