I have never had a linkedin. When people ask, I point them to my github and tell them that's where I network.
There are multiple reasons for this. Using one account for both is not desired for the worker nor the employer. Especially if you want to retain your GH profile between employments.
One reason is similar to why you shouldn't run your GSuite business from the same Google account you go on crunk YouTube rants with.
This sounds like the same lesson learned by the @music guy on Xitter.