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> The crime of stalking can be simply described as the unwanted pursuit of another person. Examples of this type of behavior includes following a person, appearing at a person's home or place of business, making harassing phone calls, leaving written messages or objects, or vandalizing a person's property.

Except for the last point, that sounds like ads :)

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ads vandalize property by causing unwanted images to appear on and unwanted sounds to emit from personal property

Vandalism usually means permanent damage. You can call the police on your neighbor for playing loud music at 3 am, but I don't think it would be correct to accuse them of vandalizing your property.

Is a highway billboard vandalism when the owner of that billboard is allowing the ad?

Or are you referencing computers with ads in them (websites, etc.)? By that definition, anything disproving a conspiracy theorist is vandalism to them. That’s not how that works.

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