Unreal licensing is crazy compared to Unity. A % of revenue is millions of dollars potentially. You cant compare that to the fixed opex per developer seat with unity.
It’s a strategic design for a company to use one or the other. So far in all companies I’ve worked for and have consulted for attribute their choice to cost and ease of hiring.
I built something similar a couple of years back using Anka. I got the help of lawyers to help with some details but there were definitely cases where Apple’s non explicit stance (until recently) makes you stop and think. https://www.filip.dev/posts/veertu-interview/
These things are a trade off.
Developers should be targeting a platform rather than the hardware. Why would the user be concerned about the app pegging their ram and how to deal with it.
I’ve used Anka for running macos VMs with good success. So much so that we replaced all our bare metal workloads with portable and repeatable environments. The trade offs are performance related and bugs with the VM tech but those are less costly than managing the bare metal.