To me, this sounds more monolithic than containers. I think I'd like something less monolithic. However, those who like monorepos might be more quick to develop an interest in this. I could of course use containers within the MicroVM, which is what I really want anyways, because I want lighter weight containers than MicroVMs for sandboxes.
While looking into giving fly another shot as a cloud provider even though I think it's still pretty much a commodity for me, I found an issue in Google: I searched for "fly.io sao paolo" and the title of the first result on fly.io is "Regiones · Fly Docs", translated from english to Spanish. While I find the translation in titles on Google annoying, I haven't often seen the characters messed up like this. I reproduced this in Incognito at this URL: https://www.google.com/search?hl=es&q=fly.io%20sao%20paolo