It’s worth noting that the link he provided is a decent overview, but it’s also really outdated as far as the decompilation community goes. If you’re at all interested in getting involved, and not just mildly curious about the high level stuff, most people start with one of two discords. One for decomp.me and the is the N64 decompilation discord.
That’s revenue, and not profit. If they funded the port themselves, and didn’t take Apple money, this would absolutely be a huge loss. It also serves as a reminder that phones just aren’t the right platform for games like this.