Comment by blacklight

The thing is that, in a platform based on link sharing, it should be known which domains point to URL shorteners.

Even if you automate their handling, the algorithm should know that, if it bumps into a say signal.me, bit.ly or goo.gl URL, it should first do a GET and then apply the algorithm to whatever is provided in the Location header.

Not doing this for a widely used URL shortener like signal.me is just a show of technical incompetence.