I sent a DM to almost 10k people on OF 2.5 hours ago and it has zero views.
I'm aware people are working and what not but it really is an indication of how much spam is on there.
Some people don't check DMs at all anymore because it's overrun. On the other side, I've also been told some people only use DMa because their feeds are all promo of other creators (other girls under the same agency).
I implore you to unfollow the agency accounts that are sending you 10 DMs per day if you're not actually interested in the girl (who you are not talking to anyway).