That means if your site loads fast, you typically won't ever be serving more than a single user at once, so unless you're serving it on a burstable CPU and you run out of burst capacity, you should be fine.

It’s fairly trivial to survive HN traffic, full stop. I’ve seen the RPS live from several “#1 on homepage” posts with hundreds of comments (let alone upvotes) and as another commenter stated, it’s at most single digit requests per second.

Edit to add:

I’m not judging harshly hobby projects for not surviving it, it was a hobby project after all, but that doesn’t change the fact it’s fairly trivial to handle if you set that as a goal.

https://danuker.go.ro/how-to-protect-your-personal-data.html

I don't think anyone with a small personal site should spend too much time planning for that single, improbable, day when traffic might increase by several orders of magnitude.

With most hosts I've had, that type of increase would just trigger DDOS protection and/or take down the site with its itty bitty quota limits.