Morning Keith, hope you're well. I think it's best to reply to all three of your comments that came in overnight here.
We reached out to the bookstodon team using the public email for your instance because you're one of a few dozen Fedi folks we thought would be interested. You've clearly opted out and we respect that. We won't email you again and we have already opted out bookstodon.com from future research.
@keith
The report is a breakdown of what is happening on our federated instance - counting the no. of posts on some specific hashtags and noting how many unique users use them. Mechanically, its similar to the Trending Now part of your Mastodon UI on desktop.