Earlier quoted context omitted.
You're missing the parts where: 1: Roblox hosts your multiplayer gameservers in its pops for free, with a generous amount of free persistent storage and memory 1.a: Roblox handles scaling and SRE work for you for free - you're not going to be able to support millions of concurrent users yourself at that price point 2: when people buy robux on their phone the app store takes 20-30% of the dollar - but the player still…
72% cut's still pretty steep for all that. Like, these aren't large corporations Roblox is working with, it's kids. It's their platform, and they get to charge whatever they want, and kids can choose not to use it, but 72% still seems exploitative to me. Not a parent tho.
What Roblox provides is a platform to upload experiences to with minimal risk or skill required, and services that are heavily subsidised by money redirected from their most successful experiences. The barrier to entry is lowered to the floor, and most kids using the platform to learn game development wouldn't have otherwise learned about it if they had to manage servers, study networking, etc.
Cloud services are a thing, but they're usually expensive and Roblox is paying for them for you. Free cloud services are a thing, but they're usually very limited and what Roblox is providing is essentially unlimited.
For me, the killer app for Roblox is none of this. It's Creator Rewards https://create.roblox.com/docs/creator-rewards> (previously Engagement-based Payouts (previously Premium Payouts)), a programme where any player that pays for a Roblox Premium subscription (or is a new/returning user and buys anything on Roblox in the future) results in money earned for the developers of the experiences they play. This happens without requiring any monetisation strategy, microtransactions, or paid in-game products to be created by the developer. Nothing similar is provided by most other popular game engines or platforms.
For myself as a smaller Roblox creator with no interest in creating such monetisation strategies on my own experiences, Creator Rewards makes up a much bigger income proportion than it does for most large developers on the platform. Instead of ~10%, it's more like 90% for me, and I suspect that most kids learning to code games on Roblox without having good marketing skills are in the same bucket, and so the cut won't be nearly as steep for them.