I wasn't sure what we were actually using it for, turns out it was mostly polyfills for CSS features that are very standard now!
I didn't audit these changes very carefully tbqh because they seemed pretty simple? Fingers crossed!
Turns out ~22% of our users initially land on a trade list.
We like to keep the campaign off the pages where space is at a
premium, so we try to whitelist it to major landing pages in order
to avoid accidentally creating a bad experience on some page :)