I was confused as after buying the guy seemingly did nothing with the extension. Now I'm realizing that it has become a part of the malware community. I was also using ESCompiler to bundle files which was naturally obfuscating it a lot.
The point is that these people acquire extensions when they have a growth trajectory, then sit back and let the cash roll in. Kinda like VCs. That's why they have such a huge collection of popular extensions.
Also, To get "Featured" on chrome, you just have to fill a paltry form about accessibility etc and wait for a few weeks. "Featured" does not mean the application is safe in any way. I'd say it's the contrary since the scammers know exactly how to get the tag to look more trustworthy.