To expand on this, billionaires never park any significant fraction of their positive net worth in cash. Inflation rates alone make that a losing proposition.
So they look for other things to own that will lose less value over time.
You completely missed the context of my comment. This was a discussion specifically about the acquisition of media companies unrelated to the businesses which create billionaires' wealth.
Elon Musk himself said explicitly in his interview yesterday that he "doesn't care about the economics at all" which supports my argument. For Musk owning Twitter is not about making money from it the way he does from Tesla.
Billionaires own companies. That's what they do.