Any new exchange will always be good for crypto, especially one that already has an established user base and offers zero fees. It will be interesting however to see if they are one of those exchanges that claims to offer zero fees but that's because they make up all of their profit by offering very low exchange rates.
It wasn't exactly detailed how they would be making money from crypto. They make it work with stocks by selling order flow to exchanges and using idle money for investment
They have premium services called Robinhood Gold, I guess they'll make profit from that, don't know exactly how they would implement that to cryptocurrency trading though.
does this means that people who are from other country are not eligible to participate on the registration..
and is the exchange going to be used by US citizens only?
Currently, yes. It's only planned for 5 states at the moment as well.