No. He did it for two reasons. Lawsuits. He said something like if X happens I’ll buy Twitter. x happened and then it was on public record. So he couldn’t go back without being sued. And more importantly in the process to save face and his ego.
I think he bought it because he was addicted and could, similar to how a rich alcoholic could buy their favorite bar. I don’t think there was a nuanced long-term plan rather than an impulse mood to increase his stature and remove what he saw as rules which prevented his friends from saying what they wanted.