There are some projects form a few years ago. Mostly using Parsec but there might be more, even open source, options in that area.

But all the DIY solutions will require you to have some knowledge in regards to public clouds. But all-in-all they shouldn’t be that expensive as they generally make use of cheap instances and automatic shutdowns. So you only pay for the time you are actually playing plus the storage.

One quick search showed https://github.com/badjware/aws-cloud-gaming but I can’t say anything about the working state of that repository. But it should be a good starting point.

Another link https://github.com/LGUG2Z/parsec-ec2

Their VMs are often used for cloud gaming. Your own version of GeForce now essentially. The attacker might have told the employee to check if it works or something of the sort.

So it’s not to far fetched.

You could just go with Debian unstable. I rarely ran into issues while running it in a rolling release style.

Debian testing might also work for you. But it will have a freeze window before each release.

That is already being done right now.

You can fashion your old Mainboard into a home server. For example by using their case made in collaboration with I think CooperMaster but you can also 3D print it yourself.

The displays are just standard eDP connectors. So anyone could use that as well with a cheap board.