I'm not sure if there are any clones that really replicate IPTV Stalker and work. There are ones out there that say they are "clones" but in reality are just using scraped public streams. I've seen some of the 'clones' have gone 'private' asking for donations, which means is they might be using those proceeds to buy cheap monthly IPTV66 routes, and allow their users to 'share' the MAC, which works for a bit, until discovered.
What the server guys want to protect are streams that they made themselves, and maybe deny freeloader from accessing the system. As shown by the brief outage, I think they can disable access only from the IPTV Stalker, and leave the others alone. Best move is to just stop using this add-on, until it properly allows users to log-in using their donation number, and use the pvr or STB emu for access.