I see more of a negative side here. With the current spread of fake news that becomes impossible to regulate, I can only imagine how far worse it`ll be in the future.

As neuralink is a network device, it raises the whole range of stuff related to it: malware, antiviruses, spam filters etc. which we we`ll have to account for.

As for learning 4 year info in 4 months, I`d not say it is exactly learning - you simply download information to your brain, but you lack your own logical conclusions that you obtain while you learn stuff traditional way.