Dark Lord of Tech :
MalwareFox is Zemana AntiMalware rebadged with a different name.
Zemana can sue for copyright. I don't know why they haven't done it.
I've heard about this before and I highly doubt it. I mean, MalwareFox has been around for at least a year or so? Maybe more? I've been using it for at least a few months. If it was indeed copying Zemana, then they would have been sued up to now.
My guess is that something else is going on. Perhaps a partnership? Perhaps they rely on the same engine/API? Anything among these lines? All I'm trying to say is that if MalwareFox was indeed ripping off Zemana, then they would have been sued months ago.
Watchdog Anti Malware is another rebranded of Zemana Anti Malware as well.