> It can only mean that their Linux user base is growing, ie. more commercial operators are turning to Linux.

Well, more correctly that they think the commercial base has grown, and that there's revenue on the table by forcing their standard-edition-using commercial Linux users into contracts.

Maybe the thinking is that the Linux users are more sophisticated and able to self-support than windows shops, and so they're choosing not to buy support even though they could? Seems not implausible, though hard to measure even from within AMD.

Basically this seems like a "good beancounting but terrible marketing" decision out of product management. They're not being deliberately mean to their amateur users, they're just trying to squeeze out a few more dollars for their department's quarterly.