As salaamu alaikum,

An excerpt from the book (emphasized words in bold are mine):

“These three criteria form what we can see as the nucleus of the definition for a destructive cult:
 1. A charismatic leader who increasingly becomes an object of worship as the general principles that may have originally sustained the group lose their power; (They have a network of dynamic speakers who put on conferences and seminars. People usually leave them in amazement. Originally, it started out as “calling people to the true Islam”.)
2. A process I called coercive persuasion or thought reform; (Stay away from “ahlul bid’ah wal hawaa'”; “don’t read the books of the innovators”, etc.)
3. Economic, sexual and other exploitation of group members by the leader and the ruling coterie.” (A cursory glance on the Internet and social media will reveal all of that, I don’t even gotta tell you!)

Pay attention!