There's a current Chinese donghua "Rich Player" about this phenomenon. :) https://www.youtube.com/playlist?list=PL7RWlrbEwKUNKvRA66Ert...

The protagonist spends Yuan 30 billion in a game. The game currency looks a lot like bitcoin and after the initial purchase no further purchases can be made. So, he controls the in-game premium currency market and owns the vast majority. That unlocks all kinds of shenanigans. The longer it goes on, the more he alters the game mechanics. Dungeon bosses recognize him as their master and he owns entire cities, for example.