Even with consumer grade brain chips, the risk isn't a bit thing until there is a direct interface and even then it's a question of what it can interface with. And even then it's a matter of good design. Some hardware off switch would be a basic requirement, but also software firewalling would be a very basic requirement.

Interfaces, if done right, should not have to be a dystopian future, we won't become the Borg just bectof some implant somewhere

People should watch less tv.