There is no cloudflare plugin for DirectAdmin, so the same functionality can not be achieved. For those that had it working since before it should have stayed working provided no changes was made. We can however not guarantee that at this point.
Of course, there shouln't be someone elses content showing either, and that part is definitely on us to sort out.
I understand that it is a frustrating problem, but the reality is that if we hadn't made the change to DirectAdmin, it would likely have been the end of free hosting as cPanel licenses would be to expensive to keep providing free hosting, they charge a base price for the server plus an additional fee for every single account on that server.