I recently opened an account with Fidelity to invest in stocks, ETF, mutual funds. Initially, they offer investment options but basically that means they put my deposit in a Money Market Fund (called core position).
I searched the internet and found that Vanguard does pretty much the same thing. Fidelity's FAQs explains the Fund is where my money sits before investing. However, it doesn't make sense to me. I have an account at Forex.com and my funds stay static.
What are the benefits on their end for putting deposits in their mutual fund?