None of the files stored through this mechanism will be given permissions to be executed on your system. Also, the system is set up with docker which further insulates your computer from these services. The only real issues you are likely to face is running other services on the same ports (4001,5001,5005,8000,8001,8080). 
My compreface setup(which does facial recognition on my doorbell camera to unlock the door) runs on port 8000, so I had to modify the compose script slightly on my setup; but it's written such that anybody can use it as easy as possible, with a good mind for security.