Basic Internet hygiene should have instilled in most users that any data put online is immediately out of the user's control. If it's on a self-hosted site, the contents are long gone the minute you hit post. If they're on a third-party site, it'll eventually be sold to the highest bidder when the site is either acquired, or goes defunct and the scraps sold off. There is no sanitation online.

There's an API, but I'd rather not have to write my own script to export the data. Which I'll be doing lickety split.

Not a fan of Pinterest (the company), not one bit.

Maybe. Better late than never, though?

Isn't that the kind of question everybody already knows the answer to?