Blizzard is at fault more than the streamers. They are not the only game company that does this but it needs to stop being ignored. They keep inviting those with no actual QA experience to test their games. These folks focus more on content for their article, stream, etc. than actually reporting bugs/exploits.
These same people follow the Blizzard launch method of exploit now and exploit often. I do not remember a time Blizzard ever doing a roll back because of an exploit. If they have it has been years. They usually will schedule out the repair as well, giving more time for some to gain from it.
Blizzard is also at faults for those who do report gaming breaking bugs. This happens to often and constantly falls on deaf ears. For D4 the barb issues were provide to Blizzard in the private beta. Instead they ignored until launch. Breaking builds and removing drops for a few weeks. The buffs that were given have still not filled the holes.