I go running in the park, I sometimes see kids playing it in groups. I usually give them a friendly hello and ask them if they've caught any yet as I pass. It's not inconceivable that a sex offender could strike up a more meaningful conversation, so I can see some kind of connection.
The fact that you often meet kids who are playing Pokémon Go in the park, despite you not playing Pokémon Go, just highlights how utterly pointless this kneejerk rubbish is. It would be more effective for them to ban children from playing the game, and of course even more effective to ban children from ever going outdoors.
But that would not only be stupid, it would also be obviously stupid and unfair to kids.
It's seen as socially acceptable to propose arbitrary limitations on the freedom of sexual offenders, because apparently being released doesn't imply any kind of rehabilitation has happened. This just further reinforces the message that being imprisoned in the first place was about punishment rather than rehabilitation. It's a shame that vengeance and judgement are still such a big part of modern society.