Re: So no phones on planes then?
"If the crime is using a certain name for your hotspot..."
It's not that, or at least, not just that, but his intentions when creating the hotspot. The article says the man was charged with "dishonest dealings" so it's about his motivations for providing the hotspot being different from what it would appear to someone connecting to it. Also, the article says the police searched his home and found some stuff. So again, there is more to this story than just using a certain hotspot name.
There are lots of offences that could individually cover a huge range of severities, that wouldn't be clear from just a simple reporting of the fact. For example, In the UK(other nations probably have their equivalent), the Computer Misuse Act makes it illegal to access data you are not authorised to. That could cover something as trivial as your other half's laptop to get the booking reference for a hotel you are both going to, or large scale accessing of a corporate system for espionage. Both the same technical offence but on very different scales and likely very different outcomes if you were caught.