Paradox has net revenue of $1.6B while Hasbro has $4.7B. While Paradox's main business is outside tabletop games, so is Hasbro's. So they're a lot more comparable in size than you might think. Paizo is of course smaller, but googling indicates they're about $50M (being a private company, the figure is obviously less reliable), which is smaller but not "squash like a fly" small. I'd be more worried about the likes of MCDM (Matt Colville's adventure/rules publishing co) or Pelgrane Press (13th Age).