Few weeks ago I went through most of the sites to see if I can turn off partner programs. Not everywhere it is possible so I did it when I found an option. After few weeks I can see results:
1. 123RF - no change
2. Dreamstime - it is half of what I got before so maybe in long run it would improve
3. Depositphotos - similar to above
4. YAY - it dried out totally, zero.