What is the decision-making mechanism? Will keywords be used? Artificial intelligence? market movement? Or what.

Suppose, for example, that Elon Musk mentioned this tweet: I will buy #Bitcoin for $1.

 - Will the decision-making be based on keywords, for example, Elon, bitcoin, buying?
 - Or will artificial intelligence decide?
 - Or will the algorithm monitor the market and from which the decision will be taken.
 - Or will the influential people control the execution of orders?

Personally, I see that even the influencers depend on the herd policy, and therefore they will not create the market trend, but rather contribute to amplifying it.