I agree, though I was and this is actually sort of off point. The list was profitability, not value or asset value or holdings value. I was surprised Microsoft was in the top 5. They must be killing it in the cloud business. Which is sort of weird since most public server farms use linux. But I suppose in the large private sector, contracting with Microsoft is a good bet.
There are lots of Linux servers in Microsofts Azure.
https://azure.microsoft.com/en-us/services/virtual-machines/linux/