Half a year ago I tested the ActivityPub plugin on one of my personal WordPress sites, but then deactivated it. I added 410 redirects.
To this day, that site is getting inundated with requests by hundreds of Fediverse servers — for crap that's returned nothing but a 410 GONE for >6 months now. Will they ever give up?!
I'm pretty sure that no one ever thought about that. I use this site for the occasional test and my logs are total shit to look at because of this.