"I discovered that many pages were showing up all over the Internet -- even from China -- with no attribution to me and without my permission."
Those are crawler sites. Nobody was stealing your information, it is bots that skim the entire internet and mimic cheap domains in attempts to spread viruses and spyware. That's all it is. And Pinterest is just people pinning interesting things they found, so that other people can find it. It all links back to the original site. Nuking the whole site over something so trivial was pretty extreme. It reminds me of the same thing Hank did with Hank's Truck Photos website. Destroyed it all and walked away without a care after it was online 20+ years.
Also keep in mind - information and research belongs to everyone - not just one person. You can be credited for your work in research and assembly of random facts, stories, and tidbits, yes, but the work as a whole belongs to all. This is the whole reason libraries are free to use and browse through and access the information attained. I have never heard of someone paywalling a library or making it so only certain people can use it and access the books within - gatekeeping, if you will.
PS: If the information affects you that personally, why not just publish the contents of the entire website and everything on it into the form of a hardback book? Then you can sell it and provide it to collectors. They can access and study the information, it won't be online like you want, and you don't have to worry about e-theft. Problem solved.