I never saw the use-case for it.
I’d sooner use a faster, cheaper, more energy-efficient, more centralized crypto like XLM or XRP.
But even then: for payments it’s hard to compete with Visa/Mastercard for speed and safety.
And as a store of value all crypto is crazy volatile.
If BTC goes sub $2k, would anybody reasonably want it anymore or would the emperor have no clothes?
Not calling you dishonest, it's just intentions and actions aren't always as connected as we want to think
Cryptocurrency has a future and Bitcoin is as necessarily part of it as much as Netscape and Yahoo were necessary for the web. (Or US robotics and compuserve, pick your loser)
The thing itself can survive the collapse of the current winners.
I don't know why anyone does otherwise.
Let's assume that 5 minutes from now, Tether drops to zero. Turns out Tethers were approximately 100% unbacked.
There are currently ~$80B USDT in circulation. Even if you also assume 100% of USDT holders were also Bitcoin maxis who were using USDT as a "stable store of value" when they periodically want to exit their BTC position, the market cap of Bitcoin is still ~$500B, so the $80B -> 0 drop is still only 16% of BTC's market cap (and obviously USDT is not only being used to exit BTC positions but also ETH and every other crypto besides).
The 24 hour trading volume for Tether is $175B. The 24 hour trading volume for BTC is $80B (as I write this). Tether is the money in the system.
Tether is a vehicle, not the money in the system. People use Tether because it can be traded against your favorite coin on your favorite exchange. For example Binance (the largest crypto exchange) doesn't offer any USD pairs, so if you are someone with a lot of dollars you buy some USDT with your USD at 1-to-1, then you go trade that USDT for whatever you want.
USDT causes a crash in crypto based on two properties: actual fraud / funny money shenanigans and market sentiment. I was only really addressing the former in my analysis, because "market sentiment" is basically impossible to do anything useful with in a future-telling sense.
If you and I both agree to trade 0.000001BTC @ a price of $1,000,000/BTC, meaning the total value of our trade is $1, and we both know that the supply of bitcoin is 19,000,000 coins. Does that make the "Market cap" of bitcoin 1.9Quintillion dollars? Obviously not.
Market cap is a historically bad metric to track when comparing things like this.
So back to your question at hand, how would a $80B USDT market cap topple a $500B market cap. Well, first we realize based on the above silly example, $500B isn't necessarily the real value. If Bitfinex (tether) has been printing USDT and using that to buy bitcoin, then the market cap of BTC is inflated by an asset effectively worth $0.
Once this realization sets in, panic selling starts, and there is an overwhelming greater number of sellers than buyers, and it doesn't take $500B worth of trades to topple a coin with a $500B market cap (if that market cap is inflated by hopes and dreams).
At some point, processing bitcoin will become uneconomic. It will then be unspendable, and the price will then drop to zero.
If hash rate were to suddenly drop say 90% then it could take months to adjust
As a programmer or system designer I urge everyone (who hasn't already) look at the "system design" of bitcoin ! It's beautiful and elegant, like a self-correcting organism ! Ja sure it's not perfect, but dammit it's a hell of a lot better than what I could have come up with :)
I'm of course ONLY talking about the system-design components here: (difficulty, mining, minting rate, consensus, ledger etc)
YMMV