Microsoft is furious. last week,

UK's Competition and Markets Authority (CMA)

A surprise decision sparked concerns about the future of cloud gaming,

Abandoned a $68.7 billion deal to block Activision Blizzard in the UK.

According to Bloomberg, Microsoft chairman Brad Smith was awake at 2 a.m.

And were writing responses from across the pond.

He spoke to the BBC a day later and criticized the UK regulator's decision.

called the "darkest day" for Microsoft in its four decades of operating in the UK.

He went a step further, saying that "the EU is a more attractive place to start a business than the UK".