If this concerns you I would advise not looking into pretty much any UK law which is full of subjective terms and ways to interpret them. The law isn’t an algorithm nor should it be. Just because you can’t understand how it works doesn’t mean it doesn’t work.
Sorry, that was a low shot, and not meant truthfully, but I just couldn’t resist making an offensive comment when the topic was “you can be arrested for offending someone”.
There is no statutory definition of “grossly”, so in effect it is the same. There is prior art for it being interpreted incredibly widely.
Not to mention the other incredibly vague adjectives in the law.
> Correct
https://news.ycombinator.com/newsguidelines.html “Don’t be snarky”.