Steam

• YouTube takes 30% from fan-funded revenue
• Twitch takes 50%, which was an increase of their 30% cut, and people have called them out on it
• Apple take 30%, but recently reduced that to 15% for apps making under $1M/yearly
• Google Play has the exact same system
• GOG takes a 30% cut
• Epic Games takes a 12% cut, but they are purposely operating at a loss and this comes with a lot of strings attached (exclusive contracts, passing transaction costs to users, etc.). This is not sustainable, and developer should expect an increase as soon as they take over more of Steam's userbase. (If they take it over...)

Overall, calling a 30% cut "ridiculous" is patently false. It is the industry standard.