Even if Robinhood goes after them, they don’t have any assets or money. Unless there are criminal charges (which there might be), what could actually happen?
Some states are better about protections against creditors than others. Don't live in a state with poor creditor protections (Florida is fantastic, Missouri is terrible).
So your 6% loan is now a 9% loan.
And yes, Prime is low today.
Also, if you can make a play for real property: buy dirt. It's a good financial play to build equity/wealth.
I never used credit from 18-25 aside from churning some credit cards.
Income and assets are king when underwriting a mortgage, credit less so (depending on investor desires of the mortgage backed securities).
https://www.hud.gov/sites/documents/4155-1_4_SECD.PDF (FHA Guidelines: Borrower Employment and Employment Related Income)