According to cloudflare: We use Cloudflare, because we want our customers to always have a good expierience on our website and always have a fast loading webite, if they visit us. Cloudflare also provides a good DDOS protection. We don't want downtimes because others perform DDOS attacks to us.
I think what @dkbit98 wanted to emphasize is CloudFlare decrypt traffic data which isn't good for one's privacy[1-2].