Not being a member in the forum does not mean that one can do enough research and conclude that 1xbit is scam.
On a private window of my Firefox browser, I just typed in "1xbit Scam" in the Google search engine and in the third place of results this is what I saw.
Among the scam accusations is their ANN thread

Clicking on the highlighted thread as a guest user, the warning is so clear

By the time someone is scammed by 1xbit, they are either too big-headed or did not do basic due diligence at all.
Sad to see more and more are becoming victims of this site when like what you linked here that a single click in google you will save all your money from being locked/freeze or taken by this site.
but maybe some are just newbie in gambling world that had no complete idea how to manage checking .
though this is why site like this are still existing because of those willing or non willing victims .