People host their blogs on AWS lambda for less than dollar per month [1] compared to "standard" $5 or so for VPS. How's that a waste of money?
Docker and containers are also a paradigm change, but the world seem to have adopted it just fine.
S3 is hosting the site. S3 is awesome for static site hosting, in fact. I also use it.
If I bothered setting up my own blog, I certainly wouldn't spend a bunch of time setting up comments on Lambda just for my two corporate-firewalled readers when I can just use a hosted solution. That is, if I even cared about comments in the first place. There's just much more interesting things to work on, with and without Lambda.