This just reminds me of the trope of the peasant village right besides the Demon Lord castle or something along those same lines, you usually see it in those stories where some kid from the boonies doesn't realize he's stronger than absolutely everyone because he moves from the end game village to the starter village that everyone talks about being the place where adventurers go to, or something along those lines.
Seems like an interesting variation. I do wonder how much the culture and everything else will be detailed regarding the whole streaming thing.
Welcome to the Impregnable Demon King Castle for example does a great job detailing how the whole streaming thing has altered the relation between adventurers and those who maintain dungeons. the economy and a bunch of other details, and also has a good explanation as to why Black Mages (debuffers, not elementalists) aren't very popular in a sensible and comprehensive manner.