I have a website with about 1 million monthly pageviews.
My experiments with placing some small, unobtrusive adsense units up did not yield much revenue. About $500 per month. Then Google complained about me not having a GDPR consent thing. I tried to build one, but never managed to get Google to accept it. So I just removed all monetization from the site. Since then, I don't make any money from it and pay hosting etc out of my own pocket.
I would like to work on the site again, but there would have to be some way to monetize it. Are ads a viable approach? What are the typical CPMs for entertainment websites these days?