Probably safe, but verify the GitHub repo’s reputation.
However, the very presence of a custom slug demands scrutiny. While it could be benign, it can also be used to mask malicious destinations. bitly mfixer1
You don’t know the sender. Step 2 – Preview: You navigate to bit.ly/mfixer1+ . Step 3 – Analysis of Preview Page: Probably safe, but verify the GitHub repo’s reputation