That is Chinese New Year, it has always a very large drop. It's very impactful but expected and yearly.

My companies reporting needs to correct for it since the date shifts on western calendar and if would mess up all reporting otherwise, so yes, this is extremely significant.

It’s sad that these posts of relevant facts - that are only presented as such, with no judgement - are being downvoted, apparently because they don’t supportive a narrative. One of the things I’ve always loved about Hacker News was how the community was so curious about truth. I guess all good things come to an end at some point.