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There seems to be a lot of "city" spam. See https://mstdn.io/tags/sydney for example. Its about 80% escort ads.

That's not spam. That's from people on Switter. It's an instance for sex workers.

Hashtagging dozens of cities though? These look like spam ads for the pimps.

You can mute switter.at if it bothers you. Click the three dots on a user's profile and you'll see the option.