Look any game aimed at children is going to have this issue. And trying to force the kid to never play the big game all their friends are almost certainly playing is a fool's errand. Best bet is to let them do so with supervision than to end up with a kid trying to play in secret on their phone or something.
Along with just... Talking to them about this problem and what to do if they encounter someone being creepy to them. Kids can be pretty smart if you help them and make it clear that they can come to you for that help.
Supervision isn't sat down watching them the entire time. It's keeping an eye on them and monitoring what they are doing. And maybe have whatever they're playing on set up in a space that's easily viewable.