If you are talking about making instant profit when Musk tweets about bitcoin, then yeah you can take advantage of it. But its easier said than done. By the time you read the tweet, you will already see the pump happening. You maybe too late. Too risky, but if you can enter early and exit at the proper time, you will like make some good profit.
True. He might create some volatility, but at least more people are entering the market and knowing how crypto currencies work. As more people enter, the stronger the market will be. The more the people learn, the less the market can be manipulated.