Is Reddit violating open-source software licenses?

I was curious and noticed that Reddit uses a bunch of open source (MIT, BSD 3 clause, Apache 2.0, etc) licensed javascript libraries. I looked around both on the website and in the minified source and did not notice the license being retained. I am just curious if Reddit is violating the license terms by not showing these licenses.

This answer on SE implies it might be: https://opensource.stackexchange.com/questions/9258/how-does-javascript-minification-process-comply-with-requirements-of-opensource