When big corps buy small startup just to kill it off because it might eat into their cake or because their competitor might buy them, that's game theory.
You've described a situation. A situation itself is not a game theory. A situation might lend itself to being modelled using techniques from game theory, but you've not pointed at why.
Someone could equally say the situation you described is 'strategy' or 'design' or 'product management' and it would be equally enlightening.
Someone could equally say the situation you described is 'strategy' or 'design' or 'product management' and it would be equally enlightening.