If you're looking for alternative portable streaming services, here are a few options:
M4UFlix itself is not an authorized streaming service. It hosts copyrighted content without proper licensing, and its availability changes frequently due to legal takedowns. m4uflix portable
If the portable version is configured to use autorun.inf (rare on modern Windows), it could automatically install viruses when you plug the drive into a new machine. m4uflix portable
While the platform is popular for its free access, users should be aware of the significant risks associated with unofficial streaming sites like M4UFree.tv. m4uflix portable