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Thanks, I found both (checking cloudflare and Google Analytics) and discovered that bitcointalk is not using Google Analytics which is a good thing.
The main reason people use cloudflare and google analytics is convenience... Cloudflare gives you easy tools for managing your dns records, it helps you setup your nameservers with your registrar, it holds your hand while setting up SSL (if you use the flexible option, they even hide the fact that in reality you're a non-https site, and make it look like you're an ssl site), it gives you all these plug and play tools, it's cache saves you bandwith, to a certain degree they offer some DDos protection,...
This make sense but when privacy is the only one thing which your service needs to provide then sites need to have a technical team to handle all these. It's not just a service where you buy a theme from themestore and buy some hosting, call a developer and a graphic designer and the site is up and run with a customer service.
After knowing the knowledge from your post I feel like instead of using a mixer which has cloudflare's SSL - it's better just to do some coin controlling by myself to make it a bit confusing for chain analyzers before sending my coins to a desire address I want :-P
It's not used only to handle high traffic but BTC mixers are targeted with DDOS attacks perhaps more often than Bitcointalk is, especially if it's popular service. The more popular it is, the more DDOS it gets. I think they also use it to hide server IP
Between blackmail extorsions, I even suspect that some Mixers attack other Mixers, among other methods they use
It seems I was wrong judging them earlier. Good to know.