[RandomCitizen12]

Typically an ETF takes a management fee of 0.1-0.5% of assets per year. I expect this build-your-own-ETF to do the same, with fees on the higher side.

[pants2]

They specifically say no AUM fee.

[IG_Semmelweiss]

This can change on a whim and you have no security against it.

For example, Guideline. They charged fixed fees on employer 401k accounts , until they didn't earlier this year.