3 months ago, BTC price was ~8k USD/BTC, and now sits at ~10.5 USD/BTC... So is it really sitting without earning interest? What other investment gives you ~180% interest rate year over year[0]? I wouldn't exactly calling this "$1 billion sitting without earning interest".

[0] I know I'm oversimplifying here, there have been ups and downs in price, etc

The price will go straight back down below 8k if they tried to sell it. Nobody wants 94k bitcoin.

I turned USD$1 worth of BTC purchased in 2010 into a >$100,000 Tesla in late 2017.

Bitcoin is essentially deflationary. If Bitcoin maintains its utilitarian value, it will only grow in monitary value since less and less coins will be minted until no coins are minted, and also as people lose access to their keys.

I speculate that in the future, Bitcoin might become valued so highly, that people don't even bother using it in favor of other coins, and as people don't use it, no one then accepts it, then it loses value, and by then people are accustomed to using other coins, and Bitcoin dies. Who knows, I probably won't live long enough to see it.

No matter how unpopular it becomes, it'll just be lowered in value, eg, deflated, but still usable. It will never fail unless the cryptography underlying it (or a bug in the design) causes it to fail.

> I speculate that in the future, Bitcoin might become valued so highly, that people don't even bother using it in favor of other coins, and as people don't use it, no one then accepts it, then it loses value

This is similar to Gold with the difference that it still holds value, it is so expensive that usual shops don't accept it though but still has high value, am I missing something?

Bitcoin is deflationary relative to USD, so it benefits from inflation without additional issuance. Assuming the demand and(immeasurable) real value of Bitcoin holds constant, we should expect its price to increase at pace with inflation.

Bitcoin is inflationary, as there is new money created every 10 minutes or so. Wether it increases or decreases in value relative to the USD is subject to speculation regarding the expectations of the "demand" of bitcoins, which are certainly not stable. USD on the other hand is much more stable regarding inflation or deflation.

It's a bet that the price of BTC will increase (with respect to fiat).

It's comes down to perspective. If this individual or company has $1000 billion in an investment, $1 billion is just chump change.