I have always been paranoid about spreading the load. Invariably if I concentrate too heavily on one platform something happens. I work a lot on POD sites, it's not necessarily a risk you might get banned for whatever reason, but also their fees may suddenly go up, reducing your commission. Or the company might stop paying altogether (EyeEm). You have to be flexible to survive online without being too much of a magpie.

Great article and a very important subject to highlight so thank you!