I like having access to these experiments. This site is literally a free 3d-object hosting website. I pay nothing, so why should I expect stability, lifetime access, etc. etc. all of which cost money?
Google couldn't monetize this, but maybe someone else can. Google was the first to do an office suite in the cloud. Now there is Notion, Airtable, etc. all of which exist because Google was willing to put its experiments online.
And yes, they mine and scrape all the data from these experiments to fuel their other paid services and ad engine, I know, but still I prefer access to these experiments. They're often ahead of the curve, and no other company is going to be able to offer all these things.
I'm not a Google fanboy at all, but I don't mind if they shut down free "products" like this if the tradeoff is that we get to see and use new, innovative products earlier. We all benefit from seeing what's possible. Applies to lots of products: Stadia, Drive, Maps, etc,