Yes, 100%.
But here's how to think of well-known money making trends online - if there are floods of courses and gurus in the field, then the goldmine-days are over. That doesn't mean it's not profitable though, but as a general rule of thumb in making money online imo.
I had a ton of success with dropshipping + free social traffic btw, never managed to break profit doing FB ads targeting the US and engaged shoppers bla bla bla. aka the bullshit the gurus tell you. I can't understand how I used to believe that shit lol