I’m skeptical that you’re giving the full story, given the number of popular websites I see that use apex domains and have assets on the page that they’d want to deliver via CDN.
Have you tried accessing a www subdomain on those popular websites? I guarantee you that they are there.
You said that you don’t trust it. Yet all of these websites have it.
What don’t you trust? Whether you type in www or not, it goes to the same place.