To some extent, tourist scams are everywhere. You just don’t fall for the ones in the US because you’re not a good target.
Tourist scams target people who are out of their element. They’re in a new place, they don’t speaking the language, they’re obviously targetable because they’re carrying around maps and cameras and don’t know where they are.
You’re looking at an English language website directed at Americans going to other countries. A website in Mandarin, or Hindi, directed at Chinese or Indians traveling to the US would list different scams.
To some extent, the regulatory stability of the US does help prevent them.
Lots of countries have no taxi meters and you always have to negotiate the price before you get in. That doesn’t happen in the US because taxis are well-regulated.
Countries that have multiple currencies, some past devaluation of currency, or a mix of old and new money make money scams much easier to pull. That’s a lot harder to run in the US because we have relatively simple currency that hasn’t changed in a long time. There aren’t any “old” dollars around that are worth 100th of a “new” dollar.
More developing countries have less established financial systems, so you have to carry around more cash, which makes pickpocketing more of a threat. And so on.