Yeah, I figured, that's why I needed to pull up the Halocharts page for it to get that specific. Tuesday was a bit lower than today or Monday but even then peaked at over 2.5x the end-of-life peak Oddball population.
Interestingly, CTF has been dropping since Monday. It sat pretty comfortably between 4.5 and 6k at peak when there weren't challenges, but it's been down below 3.5k all week. Either folks aren't in love with Infinity CTF (a real shock) or Objective ate into that population (less likely, since it was doing fine when 2/3rds of those gametypes had their own playlists). No idea how it'll hold up long-term, but a three-day trend is a start.
I really hope Infinity CTF ends up being the culprit, because that monstrosity needs to go as soon as possible.