There has always been a lot of discussion about which hadiths are authentic and which are not. The presence of non authentic hadiths suggests that some people modified or made up hadiths. There is always the possibility that all the non authentic ones were slowly modified over time by people unaware of it, but it seems unlikely, especially since the "uncertainty period" is quite short (the period before all of them were written in many different sources).
Has anyone ever been punished for this ? What would be/was the corresponding punishment ?