koobas.hobune.stream
what happens to the revenue made by a game
what happens to the revenue made by a game
This is a complicated question, but it depends on how you publish your game. The distributor takes a cut; if you self-publish a game on a Steam, then Steam takes something like 25% of the revenue. The publisher also takes a cut; if you get a deal with a professional publisher, there'll be terms in that deal between you in them. If you sell a game from your own website, then you don't have to pay distributor or publisher fees on those purchases, but you lose out on the marketing help that distributors and publishers can give you (though I've seen plenty of indie developers sell games through both Steam and their own website).
Unity itself doesn't take money directly from your revenue, but they do require that you purchase a subscription to a premium Unity license if your game makes you a certain amount of money (described in more detail on their license comparison page).
Unity is an engine that helps you program games. What you do with the games you make, how you distribute them and collect the revenue, is entirely up to you.
You want to burn your game onto DVDs and sell them at a carboot sale? That's fine. Or upload them to an online portal like Steam, itch.io, or GOG and get paid straight into your bank account? That's fine too. Or just put them for free download from your website. Unity doesn't care.
