Когда у меня было 2500 работ, я писала "запрос" шаттеру.
Вот ответ "Thank you for your interest in Bigstock.
The Bridge to Bigstock is a program that allows Shutterstock contributors with the highest lifetime sales volume to automatically copy all of their approved Shutterstock images—existing and to be approved in the future—to Bigstock as well.
Participation in the Bridge to Bigstock is by invitation only and on an opt-in basis, we are inviting Shutterstock contributors with the highest lifetime sales volume who have accounts in good standing.
If you keep uploading great content to Shutterstock and keep your account in good standing we will eventually invite you for the Bridge to Bigstock too. Until that time you are allowed to have an account with both sites and upload the same content to each."
На данный момент у меня работ больше, но только на шаттере.
Я так поняла, они сами решают, у кого и когда открывать "второй портфель". Либо им некогда этим заниматься.