teleforceFrance pulls last gold held in US for $15B gain
https://www.mining.com/france-pulls-last-gold-held-in-us-for-15b-gain/
This is not gain at all. At least in theory: You own some tons of gold at the start of the process, you have the same tons of gold at the end of the process.
The only real gain is that you have gold in the US custody and the US can be tempted to just use it without telling you anything.
In other words, you had "paper gold" or "virtual gold" that the US can confiscate anytime, for example after invading Greenland, blackmailing France to do nothing.
You gain custody of what is yours.
It's more of a loss for the USA, which IMO is the unwritten point of the article.
France upgraded their gold bars to a new standard and as they were doing that, gold has appreciated massively in price, so France has the new shiny easier to trade bars, and the USA has the old harder to trade bars.