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Welcome to Trollville
(lemmy.world)
Individuals displaying mischievous, spiteful, or teasing behavior in a playful manner, rather than engaging in genuinely cruel actions.
This isn't evidence but a quick google search shows articles about the Perth one in June 21, and Cleveland in September 21.
The Cleveland one has been up since 1978.
Your googling is shite... When I search for "welcome to cleveland sign" (on duckduckgo) literally the first article shows you the story of the sign and its age: https://www.atlasobscura.com/places/welcome-to-cleveland-sign