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We use Cloudflare so that we are not directly on the internet. Everything goes through Cloudflare before us, and the Cloudflare edge servers deliver most of our content. We also locked down our backend site management pages so that they require 2FA. Some days, we get literally hundreds of attempted intrusions. And this is for just a few small sites.
Another nice thing about Cloudflare is you can block (or force a CAPTCHA) based on country, browser, IP range, user agent, etc. . . For example, anyone visiting our sites using TOR is presumed to not be within our target markets, and gets a browser challenge. We also block most robots, since we aren't concerned about indexing.
The result of the above is that our server loads are minimal. Another thing that we do sometimes is run yet another CDN at AWS S3 for content that doesn't change a lot. This also makes pages load fast for a second reason - browsers will only open a number of simultaneous threads/connections to a single site. But if you load that single site from several locations, it will load faster.
ETA: we also get a second level of security. By running through Cloudflare, people don't actually know who hosts us. It's AWS - no big secret, but our attack surface is smaller.