Well yes of course. But then you have to manage everything yourself. The whole purpose of fly.io, heroku, raleway, etc, is that you don't have to care (much) ab

Well yes of course. But then you have to manage everything yourself. The whole purpose of fly.io, heroku, raleway, etc, is that you don't have to care (much) about ops & sec. Handling it yourself (or hiring someone to do it) can cost way more than 1000$/m. When you grow big enough it might not be worth it anymore, but for smaller project, it can be really useful. And for the record, at the moment, I host most of my service on my own server.