Even if that was true (and you have no evidence of it), nothing he said in those videos was wrong. And his video about MuseScore was not very complimentary; he

Even if that was true (and you have no evidence of it), nothing he said in those videos was wrong. And his video about MuseScore was not very complimentary; he called it a “dog’s dinner”. But to address the wider point, the same complaint could be made about anything anyone ever wrote anything for money. Since some works written for money have lasting merit, the mere fact that something was written for money should not count against it.