Peddling non sense on LinkedIn mostly is bullshitting. It can be very lucrative bullshitting and I’m happy to fork the money to people devoid of any sort of ethics when I have to leverage it while sharing your overall opinions on LinkedIn influencers.
But there is significantly more to marketing than that and some of it (pricing strategy, distribution, understanding your sales channels and building relationships with your key customers for example) is actually interesting and can be very analytical and factually grounded.