Manipulation has always existed in society. Government manipulation, economic manipulation, sanitary manipulation... It could go on like this for days. And we, as individual people, cannot do anything about it. If we mean that someone (Elon Musk) has said something on social media about Doge and immediately the price has skyrocketed, I don't see any problem. Because I believe, and it is my personal opinion, that he has said it as an individual person, although he is the richest person in the world, I believe that he also has the right to express himself.
And when it comes to controlling the entire supply of Doge, I don't think Elon will ever be successful. Maybe some whales will sell their coins to Elon, but not all whales will, too we must remember Doge's supply, which is infinite.