BC.VC is a normal site. But his links are not.
1. You need to register for shorten links, if you dont do it, it will give to you a test link, if you visit it, you will get redirected to:
stream-direct.co (Suspicious website)
play.leadzu.com (Phishing website)
2. People uses it for scam people and hide malware websites
3. It haves annoying pop-ups and ads
I hate this shortener, just a chinese copy of adf.ly or sh.st.