What happens when iMessage is reported as junk?

I was clearing out my texts today and when I went to delete them, I reported a ton of them as junk by accident. I’ve done some digging on the internet and on Apple’s website and I can’t figure out what actually happens with those. Are the numbers now blocked? Do they simply get reported to Apple? Is there a way I can “undo” this?

I appreciate any help in advance.