Having worked as a professional investor since 2012, I can say these outages can happen anywhere. I've seen day long outages at exchanges where tens or hundreds of billions of dollars would have been trading, at brokers where who knows how much would have traded. I've also experienced these outages at retail companies that are more established, including TD Ameritrade (I become a customer when ThinkOrSwim was acquired.) I have also seen brokers screw over individuals on a significant scale without real ramifications.
The fact that Robinhood is telling people anything about the outage is only because they are the company they are, operating in the startup world/mentaity.
To the people thinking they should be compensated in some way...If you are doing >$1m daily volume, maybe you can contact them to see what they can do but even then, I doubt it. The way this should be handled is to have multiple executing brokers. You can implement offsetting positions if needed and transfer positions when your main account becomes available, if you are using a broker that can clear. Right now it seems Robinhood is working to implement clearing but you could still go to neutral or put on your positions.