LM317 smooths but doesn’t regulate

https://www.electronics-lab.com/lm317-smooths-doesnt-regulate/

Michael Dunn discuss about a circuit that smooths ripple and noise but doesn’t regulates the output. A well known power supply circuit is the capacitance multiplier. It doesn’t regulate, but instead reduces ripple & noise while the output tracks at some fraction of the input vol LM317 smooths but doesn’t regulate – [Link]