It's highly likely that Robinhood will do the same. It'll be parked in a money market, with the option of writing checks, etc. all of which you can do already with the other brokerages.

The new thing here I think is the ATM card and them covering the difference between the money market rate and 3%, which right now is less than 1%. They'll probably make up that difference via interchange fees when you use the debit card.

That SIPC thing though ... that's a bit of a wrench in the gears.