The attack is trivial. An attacker visits your website, views the page source, and copies your AIza... key from the Maps embed. Then they run:
Even Benjamin Franklin's face on a piece of paper can feel like a mere proxy
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The same picture is seen across the transport network - currently a third of railways are at risk of flooding, which leads to cancellations and damaged infrastructure.
The core of OsmAnd's HH-Routing is an elegant two-level hierarchy built upon "area clusters."