I'm sure lots of parents would reluctantly spend 2$ on an in-game purchase here and there, but that's not really a whale. To be a whale we're talking tens or even hundreds of dollars per day. Think of people getting addicted to those time restricted pay2win clicker games and impulsively buying in-game currency in dribs and drabs until they've spent a pathological amount of money.

GP is arguing that for Roblox, the whales are the pedophiles. Indeed pedophiles tend to be prone to addiction to predation or to hoarding porn. And they will similarly end up with out of control spending to groom more and more kids.