Why? It's not like this will be permanent, a few hours probably. And many sites exist without ads. What's there to support? A few dollars a month in fees?

The large effort to actually build and curate the content.

For personal sites like that, curators often do it for the love of the subject rather than a financial reward. Hence why some personal sites are hosted without any adverts.

Edit: I see I’m getting downvoted a lot for this comment. I appreciate creating content for the love of it might seem like an alien concept to many HNers but not everyone is driven by the motivation of turning every hobby into a start up. In fact once upon a time, in an era before Facebook and Google, the majority of an average persons surfing time was spent on non-commercial personal web sites.

That’s how my sites are run. No ads, no tracking. I put free 3D printed robot designs up as well as my personal writing. I do all of that stuff because I want to and I want others to have it. Ads are gross.

So I don’t know why you’ve gotten downvoted, but your comment rings true for me.