They prey on ignorant Jews with their missionizing, people who didn’t have proper Jewish education, and try to convince them that they are normative Orthodox Judaism, which is far from the truth.
I pray that you never need to use their “missionizing services” for a family member who lost their way (I don’t mean physically, as this is not Chabad’s true goal).
If ch”v you would be in that situation, oy, how you would regret these words!