SWTOR definitely has purchasable power, since you can sell cosmetics from the real money store on the ingame auction house for ingame currency. With that, you’ll be able to buy gear enhancements on the auction house, that are required for endgame (VM operations, etc.)

How much, would you say, are the things you work on specific to games? Just trying to get a feeling for how difficult it would be to move from “general” backend engineering to backend engineering for a game.

rustup seems to be a popular choice

Not just that, it’s the official way of installing and updating your Rust toolchain, maintained by the Rust project themselves.