Just posting about a legitimate concern:
I'm pretty sure many of us have received an email from Crochetme about Graphicstock.com's special 7 days of free downloads.
I was quite interested so I went to take a look. Signing up for the service, they wanted my credit card info even though it is a free offer. I smelt a rat, googled their name and found this page: https://graphicstock.zendesk.com/entries/24942653-please-cancel-this-account. It's from their own forum no less!