Why on earth would Elon want to own a social network? What a complete waste of time and money, that does absolutely nothing to advance anything remotely meaningful. Making your focus 'Free Speech' is also a stupid starting point. We all know that its an unsolvable 'grey area' between blocking video of beheadings and politically motivated disinformation. No one can get it 'right', it's not an engineering problem.
His competitor is Facebook, another thoroughly repugnant organisation, why willingly engage in competitive sewer wrestling.
And yes, I use Twitter regularly, many times per day, it's like crack. It's never made any money from me though.