The push to live services, online DRM, microtransactions, DLC and other such things is because they have identified that there is more money to be made as a ‘server operator’ than a ‘game developer.’
They don’t really care about getting paid for the game, they’d rather give it away for free if they can make more money off controlling the servers.
I suppose it’s possible to build a system that would let you specifically allow a VPN IP to be green-listed on your account, but you’d probably have to allow it by signing in from a known good IP first.
I think it seems like lot of work for something that isn’t really private and is still probably vulnerable to exploit.