It seems that some stockphoto agencies believe that AI will soon be able to do the job. That would make them independent on those complicated contributors, and able to pay more to their shareholders.
The development of AI, the rejection politics and common greed could indicate that agencies will start to take measures in matter of getting rid of the least feasible contributors for a start.

I am afraid that the agencies face a storm of regular shithotos from people who have seen a certain, meanwhile outdated youtube video, promising them loads of money from Shutterstock. We have seen them on FB. Someone made a deadly boring photo of the first best lightpole, it was in focus and thus accepted on SS. He wondered when the sales would start. Now romours have spread that SS is not the bg deal anymore, so Adobe faces the challenge. Others do not bother to make their own photos, but pirate from other contributors, with numerous complaints, and infringment notifications as a result. 

Seen from the agencies' point of view the contributors have become a burden.

During my life I have changed my profession several times. Evverything changes faster and faster. I have realized that microstock is close to the end. I do not make new stock photos/videos anymore, but my portfolios remain and still earn med something, until that day there is an email from the agency that the service is discontinued for whatever reason they give.