Acorns – Rounds up daily purchases and automatically invests them

Great idea but a few things concern me.

1.] If you put $20,000 into Acorns, their fee starts to become more than trivial -- $50 a year.

2.] There are management fees (.05% to .20%) charged by the ETF's in addition to Acorns fees.

3.] You lose the points by not using an airline or hotel credit card.