Sorry to say this but this is rather a foolish or childish question to ask, Ai as we know are completely dependent on humans, and also will they continue to be dependent on humans for as long as they continue to exist as Ai, what this means is that they can not make or take any decision on their own without human interference or interaction, they cannot trade or invest in any asset without taking instructions and setups from human.

So in essence, Ai will only buy bitcoin when it's been instructed and programmed by a humans to do so, Ai can only predict the market based on how it is trained, but can't make any formal trading or investing.