"COGS" represents the amount that each sale costs you. For example, if you sell your product through a third-party reseller who charges 30% of any sale then your COGS will be 30% of revenue (assuming no other costs of sales).
The example chart is not actually atypical. The first company represents a normal software company that sells its products directly (either via sales staff or directly off of the internet). Many software companies have 85-90% gross margins, which is why it has historically been a very attractive industry.
Company 2 might represent an "ad mediation company" where the company gets paid by ad networks for running ads on publisher websites and the company in turn must pay the publisher 85% of the revenue it collects. This is not atypical for "middle men" who often take 15-30% of the value of the sale.
This could also be a travel website who gets paid a bounty for selling airline travel.
Companies like to have high numbers in their revenue column but this can be quite misleading. After all, if you sell $500 million of United Airline tickets that isn't really YOUR revenue. Your revenue is the $75 million you got paid in booking fees.
It could be an eCommerce website or "flash sale" where they are booking revenue from customers but then having to pay out a high percentage of the sale to the clothing manufacturer. Many eCommerce companies are in fact, middle men. Gross margins can range from 15-40%.
I know you're shaking your head and thinking, "duh" but I promise you that even some of the most sophisticated people I know get off track on this issue of "gross revenue" versus "net revenue." I saw this first hand with the growth of the "flash sale" category.
People kept saying,
"Company X is already doing $100 million in revenue! Wow! Amazing growth!"
Um, no,
"Company X is doing $100 million in gross revenue but is only at 12% margins which means the majority of the value is in the goods. Many of these companies aren't even taking physical possession of the goods in the early days. So they are really doing $12 million in "revenue." That in and of itself is an achievement. But it's very different than $100 million in year years."