There is a reasonable way to remove the risk completely with roblox and discord: prevent your children from using them. In fact, it is the only way to even mitigate the risks at all, shy of helicopter parenting.
That's like saying there is a reasonable way to avoid the dangers of going to the park; by going to a different park. There will always be online dangers, and "don't go online" is not a viable strategy to avoid them. From what I've seen, Robolox doesn't appear to be worse than other social platforms. Discord can be worse because it's really _not_ intended for children nor does it seem they put any effort into protecting children.
I go online all the time and the spaces I go into, I'm hardly ever confronted with sexually charged content and never solicited. Roblox is worse than other places online. So is discord.
If your local park is full of bums and needles and the predator registry map around it looks like it has chicken pox, absolutely going to a different park is the reasonable strategy.
