Really? Then why was Fender able to cut the headstocks off of Tokai, Fernandez and other copy basses when the landed on shore in California?
Because the shape of the headstock was patented and a registered trademark.
The only way to buy that headstock now is if the manufacturer pays Fender a royalty fee.
Like all the Warmouth (and other bass necks) that say something along the lines of "licensed product" and when they describe a Start headstock there is an R in a circle which denotes this as a registered trademark.
Otherwise many basses would have used the original design.
You are getting the terms 'counterfeit' and 'trademark infringement' and 'copy' confused.
The brands you just mentioned copied too closely and as a result of litigation they had to make some revisions to headstock shapes. That is hardly a 'counterfeit'. These brands still clearly had their own names displayed on the headstock.
Again, a 'counterfeit' is where the builder tries to pass off something that it is not, like what you see from 'Ali Baba' and else where with name brands being deceptively displayed.
For instance, Eastwood makes remakes of basses that are defunct or if they aren't the make them slightly different to avoid trademark infringement like the Eastwood EB-1 which is 32" scale and not the original Gibson 30" scale.
Sadowsky, Lakland and SX as well as others make P and J basses but they are explicitly prohibited from copying the headstock shape of the Fender basses they are based on. However they still clearly show their own brand name on the headstock. That is also not 'counterfeit'
Dillion has been asked, not litigated, a few times by Rickenbacker and Gibson to cease production of certain basess because they're simply made too close to the bass they're copying even though the headstock clearly indicates 'Dillion'.
No one would confuse the name brand Dillion with 'Rickenbacker' or 'Gibson', but this is also not 'counterfeit'; it is 'trademark infringement'.
'Counterfeit', 'Copy', 'Trademark Infringement' are all different terms and are not interchangeable.
Based on your original post using the word 'counterfeit' many manufacturers would be out of business. In your second post you use the words 'copy', 'licensed product' and 'registered trademark', where many manufacturers had to change specific shapes not to cause 'trademark infringement' or they had to purchase a license from the original manufacturer that they were copying so closely as is the case with Warmouth since they make necks to specifically replace Fender necks.
Again, no one is trying to pass something off in a deceptive way to gain profit from blatant misrepresentation. That is the difference between 'counterfeit' and 'trademark infringement'.
None of those basses in your original post displayed 'Rickenbacker' or 'Kala' , etc. on the heastocks to pass them off as something they are not. They certainly did appear to copy iconic body shapes and headstock shapes, but that is not 'counterfeit'.
An example of 'counterfeit' is the chinese 'Chibsons' That clearly display the name brand 'Gibson' in a deceptive way in order to gain profit and take away profit from the manufacturer they are copying from.
I for one detest 'counterfeit' and would never purchase such an instrument.
But I would certainly buy a Sadowsky, Lakland, SX, Dean, Dillion, etc. version of a P or J bass.