I mean what is a shady about the dropshipping store trying to sell you a cheap imported product for a 400% markup or the guru with the rented Lamborghini who is

I mean what is a shady about the dropshipping store trying to sell you a cheap imported product for a 400% markup or the guru with the rented Lamborghini who is trying to sell you on his course on how to 10000x your money by trading forex? /s I know the example mentioned is facebook, but I feel like a similar development is going on with other ad networks as well. Even on YouTube around 40-50% of all ads I get are by some guy trying to sell me on his dropshipping, forex trading, crypto or tax evasion course.