I am a user of Acorns the app that rounds up your purchases and invests the proceeds. I adjusted the profile recently from Conservative to Moderately Aggressive. While checking my balances and history I discovered it is putting my money into Vanguard's small cap ETFs, Vanguard's REIT ETFs, Large Cap ETFs,FTSE Emerging Markets. The only non Vanguard ones are the PIMCO Investment Grade Bd Index ETF and the Ishares Treasury Bond ETF. The balance is paltry but it is growing.
Am I concerned? Not in the least i am thrilled since you all here swear by Vanguard to be in on the party.