Way back in the days of somethingawful Lowtax, the admin and owner who was a spiteful shithead, would do a similar trick for sites that criticized him
He would register an account, show up, and chat everyone up. Act in on the joke. Eventually he would post a blank 1x1px image hosted on the somethingawful server in one of his comments. Then, he would view the logs that accessed the image. If any somethingawful members had an IP that matched the log they would be banned
For the young folks who didn’t exist in that era: this was pre Facebook and social media. SA was one of the biggest forums and most importantly it was also $10 to join, plus add ons like search, avatar, etc cost etc. would be like reddit costing money to join and then banning you because you posted here about how much reddit was shit compared to the old days
In my town (in America) there is literally a lidl and aldi across the street from each other
I like to imagine the staff get into fights