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It is possible for a purely magnetic motor to operate, but only if the magnets lose strength with each cycle. The motor will not operate unless the magnets weaken over time, and of course once they are depleted the motor stops! I think honest people misinterpret this phenomenon and assume that with "better magnets" the motors would work indefinitely. On the other hand, dishonest fraudsters love free energy nonsense and the only thing they will ever perpetually generate is a perpetual stream of hoaxes.
I find it fascinating that youtubes of free energy bunk get so much more attention than youtubes of legitimate engineering projects. People really want to believe, I guess.