Do users actually lose the stocks, if something that happens to the Robinhood itself? I live under assumption that it is not happening. In any case stocks should stay belonging to the folks who purchased them.
Unfortunately, there is no way to check if the stocks are really there. RH showed you some pixels on the screen saying they hold stocks for you. If RH maliciously or by mistake lost them or never bought them, then there is no third party that will make you whole.
If that takes several weeks or months in a highly volatile market its basically life or doing a flip.
https://www.investopedia.com/articles/investing/050515/what-...
I am not even joking.
And it's the same for transactions or your bank balance. The bank doesn't keep your money and give it back to you. At least, for banks, they are backed by the government and IMF. For stocks and gift card balance, I am not so sure.