I imported everything here some years ago for both my important accounts.

I am extremely uneasy about leaving my content on LJ even though I have a permanent account.

I stopped crossposting years ago. Most of my friends moved here. But that means I have less reason to keep an archive there.

I've been waffling between deleting my extra LJs and clearing out this one's content apart from a few key posts, but I haven't done it. I am uneasy for the same raesons you are -- it's not benign, and I do believe they're going to be gathering data from it. For my fandom blog, it really doesn't matter that much; I doubt they're going to come after me for f/f erotica. But for my personal blog, which could at this point be traced to the real me by a determined searcher, I'm not so sanguine. Stuff behind flock needs to stay there.