Rick Probstein posted a video about trimmed cards on his instagram:
https://www.instagram.com/reel/CsRwBAtL8_o/
It’s only two minutes but here are the takeaways:
1. Rick doesn’t care if a graded card in his collection is trimmed (and not graded as such).
2. Rick would take consignments from alleged trimmers if the card was already graded.
Interesting times.