Everyone doesn't know LUNA holder's investment will be zero, I suggest always don't invest your investment in one altcoin always invest in different altcoins, you can invest in BTC because all market depends on BTC and BTC never can be zero and we can believe that about other altcoins so invest in BTC is a good idea.
Of course, all of us didn't know what will happen to Luna in the future.
We have been praising them for buying billion of
BTC just last month if I'm not mistaken and then price pushes along with it.
But now, this tragedy affecting the whole crypto sphere, once one of the most dominant coin in the last 6 months turns to 0 in less than a day. So this is another lessons for us, we just have to be cautious of our investments, or maybe just go all Bitcoin for once in a bear market and see how it goes.