"I'd never have left Nine but cricket is in my blood and I love commentating so much that there was no option ... Kerry would understand, I'm sure of that," Warne wrote.
He also reignited the commentary wars by making no secret of his bitter view of Seven's coverage of his foundation a couple of years ago. "No, Seven and me were not friends," he wrote.
"I tell you what really got to me," the Spin King added. "Channel 7 put two children in wheelchairs in front of their cameras and said the Shane Warne Foundation wouldn't help them. That is just the lowest act.
"I felt sorry for those children but what Channel 7 did was unforgivable and misleading."
Warne also threw some shade at the stars of Channel 10's popular Big Bash coverage.
"The fact that the rights have gone elsewhere tells us a great deal about how both television and the commercial side of cricket administration have changed, not necessarily for the better," he wrote.
"I'm interested to see how some guys go commentating on six hours of slow Test cricket, as Big Bash is action-packed and very easy to commentate on."
