And I believe the better it will be documented and available for everyone, the better quality will have all “clones”.

It is always a decision of developer to go or not to go with OSH. It is about to be better than others in production, troubleshooting and improvement. IMHO business is not about fencing your design and hiding details in case you decided to go with OSH.

But let me ask you one more question: would it possible to have pixracer or auav-x2 implemented w/o original pixhawk sources published under OSH terms? If people too much concerned about clones, it will better for them to not go with OSH. Does it means the OSH (open source hardware) is bad idea in general? Does it mean any OSH developer will not success due to clones? And BTW, what are clones in case sources are open for everyone? What about the case clone could have not worse but better quality? Why developers should provide support as a company to users of clones? Are you sure they unable to ask “Give me pls your serial hash code pls” (exactly as 3DR did it refusing to support clones with success)?

Altium to kicad conversion