Dreamhost disabled a file we need to run our site

Dreamhost security bot mistakenly believed an aMember Pro file was malware and disabled the license.php file by setting the permissions to 200 (owner write only). I was able to reset the permissions, but how I can assure this does not happen again? Neither our site members nor our admins were not able to log into our site once the license.php file had been set to write only.

Why do you think dreamhost did this?