I heard about the Ovid's case because it was widely reported (and made fun of) even here in Italy.
This is one of the very few problems my country doesn't have and that I think won't have in the near future. That article and the new one Victim's linked are very interesting as I wasn't really up to date with how the situation in US colleges was. One of the many valid points it brings up is that those trigger warnings can increase anxiety about something that's actually much more innocuous. And yeah, if someone is bound to have an actual medical event caused by PTSD a content warning is not enough.
What's really absurd imo is that those books are read by highschoolers without any complaints, while this is college we're talking about ffs, it should be the pinnacle of learning. How can you learn about literature without reading it?
I know it's not the same thing but a couple weeks ago our Comparative Anatomy professor showed us a pretty disturbing photo without any warning, and only after having finished that part of the lecture he added "Oh yes, sorry if the picture was a bit crude, but you need to see these things." Ngl that photo was a little shocking for a second, but then the fact that it was a lecture and we were looking at it from a scientific perspective made me able to look at it calmly and analyze it as part of the lesson.
It's easy enough to understand that by censoring study material you're cutting off your knowledge.