50 percent? Dang, I think that was a lot and if that was true then BTC should be down to $35k now because I think its price last days was at $70k something. BTC is still cheaper compared to our last time's All Time High, so this is still a good buy but using the emergency fund to do so, seems not right for me. I mean this isn't a real emergency here.
And even if we say BTC did really dip 50% of its value, i won't still do it. I will still say that it is not a real emergency. There is also no guarantee that the price will recover immediately. We my not need the money in our emergency fund now but we don't know when real emergency strikes. It can still occur later on or maybe tomorrow or two?
As said by Charles above me, he was probably not talking about Bitcoin's price from yesterday or a few days ago, but he was referring to its all-time high, which was $126k.
Anyway, despite the fact that Bitcoin is down almost 46% from its all-time high from this cycle, buying Bitcoin with emergency funds is still not a good idea because you can't be sure if the market will go up from here or not, because we are already at the end of the bull season right now, and the bear market will start soon, and the price can go pretty low in the bear market, maybe even around $40k or something.
So, if someone buys Bitcoin with their emergency funds right now, thinking that they are going to sell immediately once Bitcoin goes up a little so that they can secure some profits, they could get their money stuck in case the market goes in the opposite direction instead, and then if they need their money for an emergency, they won't be able to sell because then they will lose money.