I run a website and get about 160GB worth of traffic on it per month, and 3TB a year for the files I'm hosting. You'd think it would cost a lot, but that's not true in my case.
The rough estimate is about 300 USD per year.
I have no ads, no referrals, no Google analytics, it's all paid out of my own pocket.
My point is, those companies are just greedy, servers cost less than they used to, and with services like cloudflare, it's even less of an issue.