shorten URL security issues and prevent them
1. use + sign behind of shortened URL
eg. If URL is https://bitly.com/GVBQJS
manually input https://bitly.com/GVBQJS+
2. unshorten them with below website
http://urlxray.com/
https://unshorten.it/
reference
https://safecomputing.umich.edu/be-aware/phishing-and-suspicious-email/shortened-url-security