I can't think of any other platform with comparable expenses. Traditional game engines have the R&D component, but not moderation, developer services, or subsidizing games that don't succeed.
It helps that seriously marketing a Roblox game costs < $1k USD always, usually < $200 USD. It's not easy to generate a loss, even when including production costs. That's the tradeoff.
Re:Roblox October Outage Postmortem
by RussianCow on Thursday January 20, 2022 @07:30PM
(#30017547)
Crazy compared to what? Nobody else is offering what Roblox offers, and building it yourself is a non-starter for almost everyone.
You have successfully made the case for a 45% fee and being considered approximately normal, or a 60% fee and being considered pretty high still. 75+% is crazy.