Exiting cloud being useful seems to be a very narrow use case.
For one, you have to be at a large enough scale where buying and hosting your own infra is feasible and cheaper.
Second, you have to give up the ability to almost instantly scale up or provision hardware in response to traffic or other events. (which is very common at scale)
Maybe his use case happens to be that very narrow case, but this isn’t something I would take as general advice.