A guru is a so-called spiritual teacher who is cashing in on their charisma and talent without having done enough spiritual (ego-reduction) work themselves. They preach selflessness but neither possess it (and it is a possession which has to be earned, always the hard way) nor, let's be honest, demonstrate it. Their so-called teaching will always appeal to damaged souls in dire need of a father figure: incomplete egos who have the sense to suss that until their egos are at least whole they cannot be controlled. Nowadays gurus are out of fashion, and instead psychotherapy is in vogue. Personally I can't see that there is much difference, and at least students of a guru are willing and capable of dedicated hard work in the service of their soul, which is much more than can be said of those with enough surplus cash to indulge their therapist each week.