just what is the motive
It is hard to imagine that Microsoft has anyone's interests in mind other than its own. They have never done that.
My guess is that any legislation Microsoft proposes would either be designed to restrict Google or eliminate any liablility for Microsoft. Like if Microsoft confirms to the legislation it is immune from being sued by customers for loss of data, breach or security or whatever other negligent Microsoft might be involved with.
And of course, any legislation making cloud related services more difficult would certainly slow down all of Microsoft's competitors.
The industry has had cloud related data services since its inception. Or practically so. Certainly in the 1970's computer timesharing was the vogue. What was that? Simply a clould. So why the urgency now that Google and other Microsoft competitors see services as a way to develop businesses not strapped by Microsoft?
Look for any limitations on liability by service providers. And look for restrictions that keep in check primary Microsoft competitors.
It may very well be that some new laws are appropriate. But, Microsoft has never had the best interest of its customers at the forefront. They are still all required to purchase IE at a secret price despite the practice being illegal.