it depends how big you're talking. Given how big some of those stars are, if the planets were in proportion they'd still be bigger than our star, and therefore wouldn't be planets. With that much mass it would collapse on it's own gravity and become a star. The gas giants in our own solar system are essentially "failed" stars.I always wondered, what if there was a star out there around the same size as the ones in posted in the op, but had planets scaled to the size of it like our own and had creatures living on it that were thousands of miles in size
Like, Galactus type sized muthafukkas actually could exist in the universe