It is a way of website protection.
In this mode,All visitors will be shown an interstitial page for 5 seconds.
很多主机商不支持泛解析，用Cloudflare 的Page rules 做301跳转实现泛解析，不错.Glovo Talk-Cloudflare Page Rules
Launched the new website with wordpress last month.Thanks to cloudflare,the website speed goes faster.Then the traffic is always rising.besides,It also saves badwidth much.
And the Alexa rank goes below 1M，Can't imaging when it will goes below 500K.