Spacetime itself is not limited to slower than light speeds, and the big crunch has nothing to do with gravity. Rogue stars wouldn't escape it. The universe is

Spacetime itself is not limited to slower than light speeds, and the big crunch has nothing to do with gravity. Rogue stars wouldn't escape it. The universe is not finitely/countably infinite. From the perspective of everything inside it, it is truly infinite. You can't escape something that goes on forever.