Well, there never was any law that required robots.txt to be honored. Big players like Google do, but I am not aware of any consequences if they wouldnt (of course UNTIL it is then regulated).
I don't think there's anything special; I very often get new-reddit results with no 'site:' qualifier. I can't think of a specific query offhand, but it happens multiple times daily for me.
That disregards the fact that facts change over time.
If you google “best DSLR camera reddit” it’s much less valuable if the results are 5 years old, even if they’re LLM free - the cameras on the market may very well have changed in that timeframe.