It's a massive brand in the content arbitrage space. Yes, you can make money with them. But they will steal your working creatives etc and kill your campaigns by reducing your RPMs. Also, they're a bunch of a-holes. Other brands in this space are companies like HiveMedia. Most do not offer affiliate programs i.e. you can't market their content to make money.
It's easier to start your own arbitrage sites. The easiest way (NOT the cheapest) is to buy sites that have existing monetization with MV or whatever and run arbitrage on them from native platforms, Snapchat, Tiktok, or Pinterest. The longer process is obviously creating your own sites, driving traffic through SEO or whatever, getting them monetized, and then doing arbitrage with them.
Arbitrage has been around forever. It's not even an Internet thing. It's really just a market thing. Though Shinez.io is a content arbitrage player, there are other forms of arbitrage. IMHO, paid ads for anything is a form of arbitrage. You 'buy' users that are mindlessly scrolling on Facebook to your Shopify store and convert them. There's app arbitrage. You can buy installs to your app and retain users long enough to make profit per install. There are so many ways.
I know this badass guy that has an email list that he sends 2 emails to every week. He nets $200k+ every month from this.
And even if you do end up working for (because you'll actually be working "for" them and not with them if you look at it sensibly), think about other long-term strategies. Good luck.