My guess is that there are companies with "legacy" applications, that can't really be re-written into a distributed system, have a large footprint, but still ne

My guess is that there are companies with "legacy" applications, that can't really be re-written into a distributed system, have a large footprint, but still need to be run. The special sub-category of those are huge RDBMS instances - a pretty common choke point in growing companies with weaker engineering teams. Some of those companies would pay basically any price to keep those DBs running.