That's exactly my point. When a game developer made a game using UE, their investment to also making a Mac port is negligible, so even if the market on Macs are

That's exactly my point. When a game developer made a game using UE, their investment to also making a Mac port is negligible, so even if the market on Macs are small it's still worth doing for most cases. When UE on Mac is no longer an option, if they want a Mac port they need to pour some real resources into the Mac port. Consider the small market they are more likely to just skip that.