For online gaming, that's 5ish game lines ?
Then Splatoon communities are pretty active, with third party tournaments, discord channels especially during fest flourish. Private matches are a pretty core component of getting good at the game in team events, and Nintendo rightfully limits how much it wants to deal with that side of things.
As a result, if your kid gets into the game, they'll be looking at that from the sideline while other kids get a lot more support.
> game wikis
In general any wikis that allows for limited scope communication, like a discussion between two users in some obscure thread where only the two will be notified of updates, is ripe for abuse. Then game wikis are where kids will be found.
While moderation teams are usually doing a stellar job, it's a cat and mouse game with utterly motivated attackers and highly valuable targets. So stuff will happen.
That kind of stuff won't surface outside of very egregious incidents, but working in an adjacent field to gaming communities, it's definitely a thing.