Also, could this be considered as a strategic element of their business or career strategy? And If so, is this a good strategy?
Billionaires like their privacy. They have no time to be engaged in public noise making they want their peace and quiet. They make their money through thinking and strategizing ways to make more money. So every little of the time counts. Whenever you see them in the news for something else it is possibly just a mistake. I wouldn't say this is for all billionaires or multi-millionaires. Some of them actually like the attention. Someone like Elon Musk, Grant Cordone , Robert Kiyosaki and some others like the attention and may even go as far as saying something controversial just to stay in the spot light. Well if it adds more dollars to their pockets, who are we to judge them
Of course, each of them has a different point of view and character and this cannot be separated from the role of the media crew as well, so that they become public figures on social media and mass media. But it is also possible, most of what we see, there are those who put more emphasis on focusing on work without the need for media exposure. I personally assume that with more exposure it is usually easy to know where the conversation is going and get feedback from what they have said.