When you're running a very simple website such as this, and you're running, say, nginx and sshd, you're going to attract a fair amount of unwelcome traffic. In fact, in all likelihood, the majority of your traffic is likely to be bots looking for ways to take over your server.

If there was something really important on your server, you'd obviously not expose it to the internet. You'd have firewalls, load balancers, cache servers, etc., and only valid traffic would ever reach the server. That costs a fair amount of money compared to a simple VM, so it's likely not making much sense to do for a blog few will read.