Mark i.

Unsplash offers many free stock images for download, and all you need to do is include some attribution to the image author on your site (put it into the "alt" values of the image).

They offer full sized image downloads (original size), so that is important because you can modify the image or resize it to fit any website, including the use of the image in a slider of a website because of its full size width.

I use Unsplash frequently for the free images because to have to purchase the images all the time will lead to a waste of money since what was thought to be a good image can turn out not as good when used on a website. The free image idea of Unsplash allows me to work images for websites much easier.

-- Premium Images --
It appears there are no premium images, all they offer are free images and they have a lot. I tried searching the site (after login to my free account) and there are no premium images, so it is not possible to compare price margins versus other premium sites like Shutterstock.

-- 4 Star Rating --
I gave 4 stars because of its downside.

--The Downside --
Their infinite scroll pages, which I dislike on any website.
I would rather have a long page that ends, and a "next page" button or link to go to the next page.
What all sites need are footers, which holds information I may need (ie: contact them), but cannot get to it because of infinite scroll. These infinite scroll designs are a nightmare to use.

I wrote about how Dreamstime cheated in getting my credit card info. Now I find that this cheat they do is the same as a "subscription scam", which is to trick people into subscribing (via credit card), getting people to pay money on a monthly basis and making it very hard for people to cancel.

See this example: https://www.buzzfeednews.com/article/craigsilverman/facebook-subscription-trap-free-trial-scam-ads-inc

What is described in the "free trial scam" article is the exact same method used by Dreamstime. Using the claim to offer 5 free images-trial period, where the images are not usable at all, yet once you subscribe and give your credit card number, it is very hard to unsubscribe and very hard to remove your credit card number.

This kind of scam is to lock you into a subscription, counting on your ignorance and/or reluctance to confront them and their false leader (free trial) funnels you into a monthly payment subcription (locking in your credit card).

When pushed, they will relent and remove your credit card information, but only when pushed (as most low-level criminals who don't want to be held accountable).