Relevant to users who link images from search engines without checking the provider (in which case, do so for any images you use) or otherwise like using Postimage for uploads.

postimage.org

On October 27, 2016, CloudFlare abruptly cut us off from most of their services except DNS for abusing their system. This came as a bit of a surprise, since although we've been using one of their cheapest plans for a long time, we had reached an agreement earlier this month that we would be upgrading our account when the next billing cycle started. A couple of Skype calls later we learned the following:

CloudFlare was very unhappy that the total traffic usage of our project had surpassed a staggering figure of 1.8 petabytes in the last 30 days.
The amount of money we had to pay monthly to make them happy again grew after each Skype call as more people in CF got involved in examining our case: $200 became $1000, which in turn became $12k.
The sales team was adamant that although CloudFlare did not officially have bandwidth limits, our violation of Section 10 of their terms of service could not be remedied by serving less image traffic and more HTML traffic (although, being an image hosting company, we have no idea how we would pull this one off anyway without blatantly gaming the system), and that at the level of petabytes of data, they would never allow that on a $200/month Business plan.
We were officially screwed.

Let us make this absolutely clear: we do not hold a grudge against CloudFlare for refusing to foot our traffic bill any further. We do realize that we are costing them a ton of money, and it is solely our own fault that our current business model is not sustainable. We also recognize that the deal they offered is probably as good as anything we could reasonably expect from other CDN providers. The only thing we disagree with is that instead of publishing estimates of how much traffic customers are actually allowed to consume at each service plan, CloudFlare insists that their bandwidth is unlimited and declines to comment on the actual terms of service.

More on site

Long story short, anyone who uses Postimage should immediately back up what they have and change image hosts in the quite possible event that the site will shut down.

I am an Imgur user, and so this generally does not affect me, but I know there are some here who may like to use Postimage or otherwise link character sheet images from this site.

@ArenaSnow very informative, thanks for the heads up. i used postimage a lot when i first joined the guild, only switched to imgur a couple months back.