Some people think pedal cloning is wrong. But better questions are, is it possible (or right) to patent something like a fuzz circuit? What about changing one small layout detail or swapping one chip's value, and then slapping your brand on it? Basically, especially with ODs and Fuzzes, there aren't that many ways to innovate. 

Here's a useful list of many iconic pedals and their much more inexpensive clones. We carry most of them:

https://spartanmusic.co.uk/blogs/smblog/15841084-inexpensive-pedal-clones-a-list