We do get people using our site for phishing (perks of a freemium model), and, being a small fish, sometimes get the whole domain blocked. Working on the uBlock thing. They haven't replied back.
I am responsible for uBlock Origin (the other uBlock is abandonware), and I haven't received anything from you. In any case, my answer would have been that I am not responsible of the content of 3rd-party filter lists, and in the current case you would need to contact malwaredomains.com, they are the ones listing you as malware.