Why are these streamers became popular? Well, they have funded these streamers enough money to be on your suggestions list visible for everyone when you visit the platform. Then, they will pay a streamer who's already popular to do fake reviews and fake game trials to entice his followers to play on that certain casino.
I didn't read the article though, but I'm quite positive this stuff has been mentioned and discussed in this matter.
A lot of annoying Youtubers and influencers are actually advertising casinos nowadays, so you already know they are paid and these streamers, YouTubers, and influencers doesn't care whether or not the casino has bad reputation as long as they earn tons of money from it.