Having been in the (software side of the) digital marketing business for a few years, I generally agree with you.
On the other hand, there are some complaints you can level at the industry. One is that they're exploiting an information asymmetry between the buyer and the seller; buyers as of yet haven't realized just how cheap and available things are on Aliexpress, and the sellers do their best to hide the source of goods. I think this will resolve itself over time as buyers get more savvy.
There are also some questionable practices. "Free, you just pay [$10+] shipping" seems aimed at some sort of psychological defect in the part of the human brain that calculates value. And digital marketers often are often rather indifferent to IP rights.
I guess my biggest complaint is that there are an awful lot of online marketers that really just don't seem to care all that much about the customer. They're often selling one-time impulse buys which are priced too low to be worth the trouble to return and they don't expect a repeat customer, ever. They've never even seen the products they're selling. I guess I want a little more value-add from my vendors - I've gone back to buying things offline where I can.
(I'm sure the article author is in a very different category of seller, which is heartwarming!)