What difference does it make really. Running a program on linux as a regular user can access all of your files, record your screen, keylog you, grab your passwords from your browser, do basically anything. Run it with sudo and what more can it do? Mess up your grub config? If a malicious program was run as a regular user it could basically ruin everything you care about unless you happen to be sharing a computer with multiple people but even then it could just wait until you run something with sudo and keylog your password.