Yes, they are all in cahoots. I once had a "magic product" vendor complain to me that I should go along with the ruse because I'm a manufacturer of audio products. This was in a public forum! I told him I'm too ethical to do that, then pointed out that my company's products (acoustic treatment) actually work and their effectiveness is easily measured.
High-end audio products are way too small a market to attract attention. Even scammers with 100 times more sales, such as the multi-billion dollar "health" products industry, rarely evoke government scrutiny.
Some of the things I read in the product descriptions of certain sponsored items here is quite... I wonder how the admins sleep at night