Hologo has an official web page that does not provide answers of any type. The site can't be reached because the URL is damaged or out of reach. This is an exchange that differs from others by the fact there is no information from the company, and it never gave services for traders. It was just released on the web as a company waiting to raise some recognition, but it was not possible.
According to official information in other official markets, those exchange became an "untracked Listing" platform, and it is now a project with a label of fraud networks. Users are not at risk since there is no way of accessing the source of the platform, but in case they need information about the site, the only one existing is to know it is no longer available.
For now, it is important to conclude this platform will never come back, at least, not as we know it. Perhaps, advanced developers want to invest in the site and create something brand new and exciting, but the low management this platform received makes it impossible to trust the reliability it could have if it's recovered.
NOTE: Despite not having risk on the access to the link provided, users might still face fraud by other scammers out there. So, beware of those unknown servers, and trade in recognized platforms.