EDIT: Downvoters, would really like to know why you're downvoting? Am I being naive in thinking a blog would be bottlenecked on connections?
Concurrent requests were usually in the 400-800 range depending on where it ranked and what it was about. That's going by Google Analytics too which means it's likely higher since devs tend to disable as much tracking as possible.
nginx won't even break a sweat if you're on a low end VPS and are serving static content. You'll have pretty much the same latency as serving 1 concurrent request (single digit milliseconds + whatever network latency there is between your server and the visitor).
A small blog can randomly get a 100,000 view spike. If the blog contains images and maybe even a gif it’s easy to blow through bandwidth caps for most free tiers.
I use netlify’s free tier but actually host my videos on BunnyCDN. I also make sure to optimize my pngs and jpgs. This isn't precautionary. It's actually necessary.