The other thing you get with a typical brokerage that you don't get, as far as I know, with Robinhood is customer service.
(emphasis mine)
7bp is an average. The article also points out that the yield occasionally goes as high as 100% per year.
If there's some savings account or bond that pays you a bit, you can stick your cash there.
Might be easier to access via IB, which seems to be a more complete offering, but I haven't actually checked what you can access there.
Also, you don't get paid interest on uninvested cash balances. Cash in my Schwab checking and brokerage accounts automatically earns interest. Vanguard sweeps cash balances into one of their money market funds. But Robinhood pays nothing, and pockets the money instead.
Obviously nothing stops them from paying interest, but they did try that whole Federally insured deposits with interest stunt a while back before the commissioner stepped in to say 'na bro.'