Although macOS holds a high market share, it holds a smaller percentage of Steam users than Linux right now. Essentially, there's more people on Linux known to buy games than on Mac (at least on Steam).

I think that it's worth trying both- Fedora is a little more involved than Mint but tends to ship the most cutting edge-stuff, whereas Mint is well-integrated with Cinnamon and fairly user-friendly.

At least the way I use AI tooling, it would be very difficult to accidentally plagiarize code outside of boilerplate I guess. The way tools like GitHub Copilot are really useful is when using your existing code as "reference", so if you use it to write a simple method, it's only going to be restructuring your existing code.

In other words, Copilot is basically just meant to be used as really smart copy-paste.