I recall a former cult member turned therapist and cult expert Steve Hassan mentioning TM as problematic, he is the first reviewer quoted by this book about the topic
Any website/domain created for the sole purpose of smearing another peaceful individual gets an instant Ctrl+W from me. TM is a bit outrageous with their pricing model, but it's just mantra meditation with a paid instructor. No, I don't work for TM and I've never paid for a TM class. I just know TM has done a lot of good for the world despite their flaws. But everyone has flaws. I'd rather focus on the positive.