To my knowledge, this isn't a "rule" that's "imposed" or "enforced" by the city - the SPCA (which is not a government agency, just a non-profit) has just asked people to do it voluntarily.
"Bird-feeder? No no, that's my squirrel feeder."
My favorite in this vein was a metal sleeve on the pole holding the bird feeder that was held up by a weight inside the pole. Squirrel climbs up sleeve, which then falls down due to the squirrel's added weight. Disappointed squirrel deposited back on the ground. It worked until one of the squirrels chewed a hole in the pole and ate through the cord holding the weight. This really happened on a bird feeder belonging to a friend's parents. (Related question: how on earth did the squirrel figure that out?)
Squirrels are smart. :-D
https://www.youtube.com/watch?v=hFZFjoX2cGg
Squirrel maze 2.0
https://www.youtube.com/watch?v=DTvS9lvRxZ8
Oh, and be cautious with those squirrels....
Outside my office last winter: https://imgur.com/gallery/LTVz9t0
woke: three drones, to stabilize the swinging, and hanging far enough that the noise wouldn't be a bother.
bespoke: a 50' pole interrupted by a 500rpm lawnmower blade at about 15' up, and topped with a bird feeder. The only reason people think squirrel-proof bird feeders are impossible is because they don't want to harm the squirrels. (and, for the record, neither do I)
Trying to social distance wild animals seems to be the action of a bird brained bureaucrat feeling like they needed to do something with no evidence at all of it being effective.
https://www.cheknews.ca/public-asked-to-remove-bird-feeders-...
My yard is crawling (hopping?) with birds all day, every day. I don't even have feeders, though. Victoria is bird country.