Outside of DoS'ing (which is admittedly Cloudflare's wheelhouse, but a rare concern if you aren't posting anything controversial or in a highly competitive space), you can host a site on a $5/month VPS and very trivially withstand being the top post on HN, making Reddit r/all, etc. Not even 10% CPU utilization at peak. And that's without even going to the extreme of making your site static.