It depends how you define 'doing well in life'.
Sometimes they appear to experience some material success over the short to medium term.
Nobody can have it all or be guaranteed constant happiness for their entire lifetime.
There is always a bigger bully out there, often younger and more vicious.
What goes around comes around and there are plenty of sadistic troublemakers with almost no morals in the world.
A vicious bully's good luck will eventually run out, no matter how much money or good fortune they have previously enjoyed.
One day the tide will turn and all that will be left for them will be reminders & memories of the good times.
Past academic or career achievements, close friendships long over, employment that they enjoyed, entertaining hobbies that they can no longer do, financial successes, good health, years of happiness, positive relationships with former partners or estranged relatives, vast wealth.
I believe that karma never forgets anyone and all karmic overdrafts will one day be repaid.