If they KNEW it was broken and were working on a fix, then they should of shut down the service. I'm sorry but this is simply unacceptable. I don't use Robinhood, but when you are handling very time sensitive contracts that can make or lose people a lot of money in a very short period of time if the service is not stable it should not of been in operation until it was fixed. I can't believe HN is making excuses for this.
If they do that, then they're definitely harming any customers who have a position they need to get out of, as opposed to only potentially harming them.
If you believe that the platform is so broken that it shouldn't be used (and I'm not arguing against that, btw) then a more reasonable solution would be to only allow position-reducing trades. That would also reduce overall trading volume on their platform.
Not that I expect them to do any of this, just pointing out that 'shut everything down' is not necessarily the best approach.