I have three stepkids ages 12 to 15 who are all interested in STEM, and we've been looking for a summer coding/compsci project for them. They're into games like Minecraft and Roblox. This might be a good avenue to take.

Back in the day, I actually talked to somebody in one of my C++ classes who made (IIRC) around $50k in a year running some kind of gaming server. I looked into it at the time, but it didn't seem like my cup of tea. I might revisit the idea. I suspect that these high-dollar figures are outliers, but it could be a good way to get the kids some valuable real-world experience and maybe they can make a few bucks so they have a little bit of spending money.

50k/yr is a low dollar figure for popular gameservers, not really an outlier.

You can't run your Roblox server can you?

You can make some mini games with their game creation IDE but no servers