Could you do it cheaper?

The $10/month gets you storage, but also bandwidth and hosting and a bunch of tooling. Worth it? Probably so if you want something that mostly just works.

After a terrible, possibly criminal experience with a hoster, I ended up with: https://www.interserver.net/

I am very happy. The speed is insane. I always thought and was told that WP is the reason for a slow website. No, it was my host. I pay around 10 USD per month but I think the smaller plans starts lower.

For what it's worth, I am very happy with them. But I only host a few WP and FreshRSS. I think they support python too but for Django I use: https://www.pythonanywhere.com/ I pay 5 USD a month there but I think this plan is not sold anymore.

Me, individually, providing it to one customer? no.

At scale, providing it to tens of thousands? yes.

It's a perfectly fine price for a customer to pay and not worry about it, but it's not squeezed to extract every fraction of a cent because competition is so fierce. In a race to the bottom you'd expect the bottom to be approached, but it isn't.

Bluehost, Kinsta, WPEngine, GoDaddy etc, are marketing companies that sell webhosting, and they have very healthy margins. They compete on ads, not on price.