If you are running Trend Micro AV Security suite you may notice that it randomly removes legitimate applications like BlackFog Privacy while it is cleaning your computer.
The best way to deal with this problem is to firstly restore the quarantined file according to this support document from Trend Micro.
Secondly it is important to setup an exception list for BlackFog Privacy so that it will not be automatically removed in future according to this support document.
Since BlackFog is under active development it is difficult for AV companies to stay on top of our release schedule and since they have to review every single binary their signature databases are often out of date. This is also why we don’t use signature based technologies as they are by nature always too late for new threats.