However, they sold half recently in order to get back their original stake.
Ruffer is a strange investment company though, as they concentrate on absolute return which means a small profit over any given year in all market circumstances. They tend to buy bonds and commodities too.
Therefore it is probably no surprise then that they took profit quite quickly.
And also, they are an out and out investment company whose mission is to provide profit for investors, rather than a corporate like Microstrategy who want to hedge their balance sheet against inflation or whatever.