Also good luck getting 1B converted to dollars without a major head-ache. I feel like 1B in bitcoin is as bad if not even worse than 1B in cash. It isn't super useful in that form.
If you tried to convert it into dollars it would move the market and devalue your holdings. But buying into bitcoin would have also moved the market in the other direction, tbh.
“The difference between one million dollars and a billion dollars is about one billion dollars.“
1k transactions and even 1k * 1k transactions are so small relative to this amount that the GP’s point still stands. This is not a very useful way of storing the value.