Nothing is too big to fail in crypto world, Terra Luna is a big example that the safety of your money isn't guaranteed even if you invest in top altcoins out there, it's the same risk involve with crypto generally including BTC but BTC is just way safer, I have seen people losing 6 figures to Luna and some Defi projects, first of all try to understand what you are going into, many don't know how risky crypto space is, take risks with what you are ready to throw away.
I think pretty much has learned over this over and over again. Its not just terra but even the top coins out there are all risky. Yes they could be blue chips but we cant anticipate such event that will occurred to them whether its good or bad. The only thing we must do is be ready and always invest only you can afford to lose. Cause who knows what attack might hit them on or incident that could lead to something like what happened on Luna.