Revealed: The real reason shoes are often placed on overhead wires in Australia

I've often wondered about this too.  Not sure the article solves the mystery though.  :D

Revealed: The real reason shoes are often placed on overhead wires in Australia - and it might be a sign to move out

The mystery behind why shoes are hung over electricity lines in Australia may have finally been solved.
Christine Abadir, an art student from Sydney, uploaded a Tik Tok video addressing the debate around why shoes were often tied to overhead wires in front of homes. 
The video began with footage of a pair of runners hanging from telephone lines on a suburban street west of Sydney.
'Foreigners in Australia: Why do you guys have shoes on your power lines?' she wrote.
As the camera zoomed in on the shoes, Ms Abadir's face popped up and said, 'a drug dealer'- insinuating the shoes are a sign that someone is selling illicit substances in a home nearby.
Social media users weren't sure whether to believe Ms Abadir's reasoning and asked for clarification.
'What exactly does that mean?' one user asked. 'There were a lot on the power lines near my school.'
'Exactly why?' one user wrote.
This is one of life's mysteries,' someone else said.
'For real,' another replied. 
While Ms Abadir didn't respond to the questions, she wasn't the first to address the common sight.
Several Reddit users have also about why shoes appear on overhead wires.
'Why do people hang shoes on power lines? I see it all the time in cities and neighbourhoods and I've always been curious as to why,' one Reddit user asked.
The most comprehensive answer offered a range of possibilities.
'There are several different reasons, which is why you never get a straight explanation,' they explained.
'Some people do it just to be annoying. Some people do it as a memorial to a dead friend. Some people do it to advertise a drug dealer territory. Some people do it because they've seen it done and just think it's funny.'
They also suggested some people do it because they think it's fun.
Melbourne-based website Only Melbourne also attempted to answer the question and presented the drug dealer possibility, but added a range of new reasons. 
The site suggested 'shoe flinging' is a tradition held by high school graduates on the last day of school or a warning or reminder of a nearby murder.
It also said some people tie the shoelaces of their old runners together and throw them over wires after getting a new pair. 

https://www.dailymail.co.uk/news/article-8166299/The-real-reason-shoes-placed-overhead-wires-Australia.html