Last I checked, about 400-500 had accepted. I put the blame squarely on me for not reading carefully, but also on LinkedIn for not warning me, but Google as well. Turns out Google has a group in your contacts for everyone you've ever emailed and it's at something like 6,000 for me, so I guess about 1/5th of those were on LinkedIn, who got invites.

Some of the invites went to people I'd banned from my sites for spamming, an old accountant I haven't talked to in ten years, and PR flacks I had arguments with over sending me press releases I didn't want. My LinkedIn account used to be a pretty well-curated list of people I'd actually interacted with in person before and done some business with, and now it's just a random hodge-podge of a bunch of internet strangers I crossed paths with at some point.