https://news.stanford.edu/2022/12/05/explains-recent-tech-la...
Copycat behaviour is not uncommon, I think, and is swayed by market sentiment. If the (equities) market ( mean in a general sense) feels bullish, then Microsoft, Google, etc. start piling on employees. Because hey, we're tech companies, we have to justify our market ratings by pursuing (or at least looking like we are pursuing) growth, so that's what they do.
Then, when things sour, the mood becomes one of conservatism. Then it looks good to shed employees. This is all despite the fact that it may have little to do with the actual state of the companies.
Microsoft in particular is hardly a heavily cyclical company, so there is little need to behave like one. Not really. They could adopt a more even approach to hiring. If they tried.
Companies bleat on about how difficult and expensive it is to hire staff. And yet, here we are.