Yad L’AChim is for Jews who get caught up in non-Jewish religions, such as various Xtian missionary groups and the like (JFJ, Messianics, Mormons, JW, SDA, etc.)
Modern definitions of “cult” could easily include any religion where you ask the leader (rebbe) to know what to do for life decisions, where your diet and dress are strictly controlled, what you can read and watch is controlled, etc. We should be slow to throw that term at others.