It's not clear why they're getting sick or what percentage of people are getting sick. It's good they're taking it seriously and being cautious.

"Our tests all came back negative for food pathogens, toxins or outside contamination,” so it's possible that it affects just a few people but they're still be being careful.

And frankly in this case refunds are implied, I would imagine that they would be sued into oblivion otherwise.

I just think it's good to see a company take things seriously and act rather than engage in PR. E.g. Theranos, Samsung etc.