"Worked" does not mean freely accessible. It means you received DNS responses when you sent DNS requests there, but there's a high chance the responses weren't

"Worked" does not mean freely accessible. It means you received DNS responses when you sent DNS requests there, but there's a high chance the responses weren't coming from Google, and that encrypted connections would fail. However, it seems that Google hosts the encrypted endpoint separately anyways, not on 8.8.8.8.