Book Trigger Warnings website/database

At work today I got an invitation to join the new book club some colleagues have just set up and one of them mentioned a website, booktriggerwarnings.com – the idea being, whenever we decide on what book to read, people can be directed to there to make sure we don't ruin anyone's day because we picked a book that has something that wrecks their head that wouldn't occur to the rest of us might upset anyone.

In theory it seems a great idea but there don't seem to be very many books on there – I had a terrible time actually finding anything. I've created an account and added one myself as that's the book we'll be reading for next month (and good god does this one need TWs lol) but I wonder, do people actually use this website or is there another that's more popular/has more stuff on it that we'd be better off using?