ahhhh, I see. true! the AP id we generate is only based on the post's URL itself, it doesn't also include the site that's posting it, so yeah, they'd collide.
any chance you have a recent example of a collision? I've been looking but haven't found one yet.
@snarfed.org @buzzing.cc here’s one: https://fed.brid.gy/r/https://www.seattletimes.com/seattle-news/law-justice/redmond-turns-off-flock-safety-cameras-after-ice-arrests/