Stress

Beef can actually appear extremely purple. This happens if the cow that was harvested was stressed out during the process. This type of purple meat is actually a relatively common occurence covering 1 to 2% of all beef.

Yes, this type of meat tastes worse and is of a lesser quality. It's also a bit sticky.

Yes, this meat will still be served at restaurants and the customers will be unaware of what they're eating.