Human cloning isn't that difficult. The machines are well known and understood and easy to build. Tell me this: if you were producing genetically modified embryos or human clones, would you be broadcasting this to the entire world? There's actually low incentive to be very vocal about this kind of activity, especially for the sake of the child and its privacy going forward in life.
>if you were producing genetically modified embryos or human clones, would you be broadcasting this to the entire world?
You're broadening the subject a bit, no? The question was about cloning. It's quite possible (maybe even likely) secretive gene modification is already happening, but there aren't any chatter around cloning the way there's chatter around CRISPR etc.
I think the main factor is extremely low demand: The people sufficiently rich and megalomaniacal to consider this are fine with IVF and can easily afford it.
What's the point of (human) cloning really? Getting 'you' to live again? The result won't be "you" even if the genes were expressed identically (they won't be), and if you try to enhance the genes - a thing this type of people would want - than the clone won't even be genetically identical. Once you give up on genetic identity you have many other better options.
