From https://solarsystem.nasa.gov/missions/cassini/mission/grand-...

"Having expended almost every bit of the rocket propellant it carried to Saturn, operators deliberately plunged Cassini into the planet to ensure Saturn's moons remain pristine for future exploration"

A series of relays spread across the Jovian orbit would be an interesting way to mitigate the effects of the inverse square law on transmissions from extra-solar probes.